Article
Environmental Sciences
Muhammad Umair Shahid, Norani Muti Mohamed, Ali Samer Muhsan, Siti Nur Azella Zaine, Mehboob Khatani, Asfand Yar, Waqar Ahmad, Muhammad Babar Hussain, Asma A. Alothman, Mohammed Sheikh Saleh Mushab
Summary: Dye-sensitized solar cells (DSSCs) have attracted attention for their low-cost processing, ability to work in diffuse light, and potential for building integrated photovoltaics (BIPV). However, their efficiency is low due to multiple issues. This study introduces a graphene/TiO2 scattering layer that enhances electron transport and light scattering. Results show that with 0.01 wt% graphene, a 33% higher photoconversion efficiency (PCE) was achieved compared to without scattering layer. However, PCE decreases at >0.01 wt% graphene due to loss of diffuse reflectance and higher optical absorption.
Article
Engineering, Electrical & Electronic
Ujjwal Mahajan, Kamal Prajapat, Kirti Sahu, Pintu Ghosh, Parasharam M. Shirage, Mahesh Dhonde
Summary: Dye-sensitized solar cells (DSSCs) have attracted much attention as a cost-effective and more efficient alternative to traditional silicon-based solar cells. However, they suffer from recombination losses that reduce their efficiency. This study focuses on surface passivation as a key approach to enhance the performance of DSSCs, and optimizing the concentration of TiCl4 has been found to significantly improve their power conversion efficiency.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Green & Sustainable Science & Technology
Xiaodan Zhang, Lei Lei, Xinpeng Wang, Degao Wang
Summary: The collection of solar energy in chemical bonds via dye-sensitized photoelectrosynthesis cells (DSPECs) is a reliable solution. Atomic layer deposition (ALD) was used to introduce ultrathin blocking layers (BLs) between a mesoporous TiO2 membrane and fluorine-doped tin oxide (FTO), resulting in improved water oxidation performance. The ALD-prepared layers greatly hindered the recombination of photogenerated electron-hole pairs in the TiO2-based photoanode, enhancing water oxidation efficiency. This study provides critical backing for effective water splitting using molecular films prepared by the ALD technique.
Article
Materials Science, Multidisciplinary
Fengjuan Miao, Fuchen Chu, Bingcheng Sun, Bairui Tao, Peng Zhang, Yu Zang, Paul K. Chu
Summary: This study presents the design and fabrication of a photoanode composed of Au/SnS/TiO2 sensitized with natural dye for dye-sensitized solar cells (DSSCs). By calcination, a layer of spherical nano-TiO2 is prepared, and a layer of nano-SnS is deposited on the TiO2 photoanode using the continuous ion layer adsorption reaction (SILAR). The sensitized Au nanoparticles exhibit enhanced localized surface plasmon resonance (LSPR) effects and electron trapping ability, resulting in improved electron mobility and reduced electron recombination in the DSSC.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Chemistry, Physical
Haoliang Cheng, Yawen Liu, Bin Cai, Carl Hagglund, Tomas Kubart, Gerrit Boschloo, Haining Tian
Summary: By using SnO2 as an electron transport material in NiO films, solid-state p-type dye-sensitized solar cells with high photocurrent density and conversion efficiency were achieved. The insertion of an Al2O3 layer effectively suppressed charge recombination between NiO and SnO2, leading to improved photovoltaic performance.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Han Song, Yu Lin, Zhengyan Zhang, Huashang Rao, Wenran Wang, Yueping Fang, Zhenxiao Pan, Xinhua Zhong
Summary: A new secondary deposition approach was developed to increase quantum dot (QD) loading and enhance the performance of QD sensitized solar cells (QDSCs) without introducing new recombination centers. By creating a metal oxyhydroxide layer around QD presensitized photoanodes, the photovoltage, fill factor, and efficiency of the ZCISSe QDSCs were remarkably improved. This innovative method achieved a new certified power conversion efficiency (PCE) record of 15.20% for liquid-junction QDSCs.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Environmental Sciences
Rania Anoua, Houda Lifi, Samira Touhtouh, Mohamed El Jouad, Abdelowahed Hajjaji, Mina Bakasse, Przemyslaw Plociennik, Anna Zawadzka
Summary: The study investigated the morphological and optical properties of Curcuma longa dye thin film, revealing granular structure and nanotubes shapes. Photoluminescence at low temperature and temperature effect from 77 to 300 K were discussed for the first time. The Curcuma longa dye showed potential for dye-sensitized solar cells with a power conversion efficiency of about 0.86%.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Chemistry, Physical
Andreas Ringleb, Philip Klement, Joerg Schoermann, Sangam Chatterjee, Derck Schlettwein
Summary: This study demonstrates the advantages of synergizing the large band-gap energy of Mg-doped ZnO (MZO) with the fast electron transport of pure ZnO, leading to significantly increased power conversion efficiency in dye sensitized solar cells (DSSCs). The successful fabrication of core-shell structures consisting of nanoparticulate ZnO cores and homogeneous MZO shells via Atomic Layer Deposition enables the improvement of open-circuit voltage and avoidance of short-circuit current losses.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Roohollah Nakhaei, Alireza Razeghizadeh, Pejman Shabani, Jabbar Ganji, Seyed Sajjad Tabatabaee
Summary: In this study, a new methodology is proposed to increase the optical absorption of dye-sensitized solar cells by cosensitization of synthetic and natural dyes. The results showed that the separated sensitization of each layer improves charge injection and transportation, leading to better dye loading and spectral expansion.
INTERNATIONAL JOURNAL OF PHOTOENERGY
(2022)
Article
Materials Science, Multidisciplinary
Tian-Chiuan Wu, Wei-Ming Huang, Teen-Hang Meen, Jenn-Kai Tsai
Summary: A simple and low-cost fabrication method of DSSCs was developed to improve the structure and performance of the photoanode. Four different TiO2 layers were adopted to fabricate photoanodes, and the use of a pressed TiO2 layer resulted in the highest power conversion efficiency.
Article
Materials Science, Multidisciplinary
Bandana Ranamagar, Isaac Abiye, Fasil Abebe
Summary: The Rhodamine-6G derivative Rhd and its metal complexes with aluminum and chromium ions were synthesized and characterized using UV-vis and fluorescence spectroscopy. Dye-sensitized solar cells (DSSCs) were fabricated with Rhd and the metal complexes, and their solar-to-electric power efficiencies were determined through current-density measurements and Electrochemical Impedance Spectroscopy (EIS). The Rhd and Cr3+-sensitized solar cell showed the highest solar to electric power efficiency at 0.16%.
Article
Chemistry, Physical
Mehdi Ismail, Mohamed Mehdi Chebaane, Latifa Bousselmi, Orfan Zahraa, Celine Olivier, Thierry Toupance
Summary: TiO2 electrodes modified with different loadings of WO3 showed increased photocurrent density and decreased interface charge transfer resistance. However, all devices modified by WO3 exhibited lower photovoltaic performance compared to the TiO2 reference cell. The highest conversion efficiency was observed when WO3 was introduced into the TiCl4 pretreatment bath, optimizing semiconductor contact for improved charge transfer.
SURFACES AND INTERFACES
(2021)
Article
Chemistry, Physical
Hannes Michaels, Marina Freitag
Summary: This study evaluates the TiO2 blocking layer in dye-sensitized solar cells using transient photovoltage and electrochemical impedance analysis, and demonstrates a feasible method for assessing the performance of TiO2 blocking layers.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Energy & Fuels
Abdullah Atilgan, Abdullah Yildiz
Summary: The development of novel bilayer photoanodes is crucial for efficient dye-sensitized solar cells. In this study, a homojunction photoanode consisting of undoped and Ni-doped TiO2 layers was prepared. By tuning the location of the doped layer, the photoconversion efficiency was greatly improved. The bilayer structure enhanced light absorption, resulting in increased short circuit current and open-circuit voltage.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Engineering, Electrical & Electronic
B. Vasanth, R. Govindaraj, P. Ramasamy
Summary: Mesoporous TiO2 microspheres with better crystallinity and larger surface area were successfully synthesized using a microwave-assisted hydrothermal technique. The TiO2 microspheres-based device exhibited higher power conversion efficiency due to its strong light-scattering ability and excellent dye loading capacity.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Chemistry, Multidisciplinary
He Liu, Tunde Blessed Shonde, Fabiola Gonzalez, Oluwadara Joshua Olasupo, Sujin Lee, Derek Luong, Xinsong Lin, J. S. Raaj Vellore Winfred, Eric Lochner, Iqra Fatima, Kenneth Hanson, Biwu Ma
Summary: Zero-dimensional (0D) organic metal halide hybrids (OMHHs) are a new class of light emitting materials with exceptional color tunability. However, their application as emitters for electrically driven light emitting diodes (LEDs) is challenging due to the low conductivity of wide bandgap organic cations. In this study, a new OMHH, triphenyl(9-phenyl-9H-carbazol-3-yl) phosphonium antimony bromide (TPPcarzSbBr(4)), is developed as an efficient emitter for LEDs. Red LEDs fabricated with TPPcarzSbBr(4) thin films as the light emitting layer exhibit the highest reported external quantum efficiency (EQE), peak luminance, and current efficiency among 0D OMHH-based electroluminescence devices.
ADVANCED MATERIALS
(2023)
Correction
Chemistry, Physical
Nam Vu, Grace M. McLeod, Kenneth Hanson, A. EugeneDePrinceIII
JOURNAL OF PHYSICAL CHEMISTRY A
(2023)
Article
Nanoscience & Nanotechnology
H. Alex Hsain, Younghwan Lee, Suzanne Lancaster, Patrick D. Lomenzo, Bohan Xu, Thomas Mikolajick, Uwe Schroeder, Gregory N. Parsons, Jacob L. Jones
Summary: By inserting a 1 nm Al2O3 layer at the HZO/TiN interface, a protective passivating layer is introduced, resulting in improved remanent polarization and endurance of TiN/HZO/TiN capacitors.
Article
Chemistry, Multidisciplinary
Niklas D. Keller, Pierpaolo Vecchi, David C. Grills, Dmitry E. Polyansky, Gabriella P. Bein, Jillian L. Dempsey, James F. Cahoon, Gregory N. Parsons, Renato N. Sampaio, Gerald J. Meyer
Summary: Photovoltages for hydrogen-terminated p-Si(111) in an acetonitrile electrolyte were quantified using MV2+ and [Ru(bpy)3](PF6)2. The reduction potentials of MV2+ occurred within the forbidden bandgap, while those of [Ru(bpy)3]2+ occurred within the conduction band states. The study reveals that the most optimal photovoltage, electron-hole pair lifetime, and surface electron concentration occur when the reduction potentials lie energetically within the unfilled conduction band states with an inversion layer.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Materials Science, Coatings & Films
Jan-Willem J. Clerix, Golnaz Dianat, Annelies Delabie, Gregory N. Parsons
Summary: This study investigates the adsorption of DMATMS on SiO2 and the subsequent reactions during TiCl4/H2O ALD. It is found that DMATMS selectively reacts with -OH groups on SiO2 and inhibits the reaction with TiCl4. Additionally, DMATMS can also react with residual -OH groups and reduce nucleation. The effectiveness of DMATMS passivation on SiO2 and H-terminated Si is quantified using Rutherford backscattering spectrometry.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2023)
Article
Materials Science, Coatings & Films
Holger Saare, Wenyi Xie, Gregory N. Parsons
Summary: Recent advances in the semiconductor industry have led to the demand for conformal deposition and etching processes in three-dimensional devices. This study investigates thermal atomic layer etching (ALE) of TiO2 and ZrO2 using different co-reactants. The results show that the choice of co-reactant affects the saturation and etch rates at different temperatures. The study expands the understanding of co-etchants' role in thermal ALE and increases the range of reactants for vapor etching of metal oxides.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2023)
Article
Materials Science, Multidisciplinary
Erkul Karacaoglu, Mesut Uyaner, Ali Kemal Okyay, Mark D. Losego
Summary: This paper presents the mechanisms of aqueous degradation of BaAl2O4:Eu2+, Dy3+ phosphors and proposes a method to prevent degradation by nano encapsulation with Al2O3 through atomic layer deposition (ALD) technique. The degradation behavior of the phosphor in water is systematically studied, revealing hydrolysis and structural decomposition. A protective nanocoating using 10 nm Al2O3 is found to effectively prevent degradation for at least 7 days of water exposure. Successful encapsulation enables the potential use of the phosphor in aqueous applications or long-term humid environments.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Biochemistry & Molecular Biology
Erica S. Knorr, Cody T. Basquill, Isabella A. Bertini, Ashley Arcidiacono, Drake Beery, Jonathan P. Wheeler, J. S. Raaj Vellore Winfred, Geoffrey F. Strouse, Kenneth Hanson
Summary: Intermolecular interactions on inorganic substrates significantly affect the electrochemical and photophysical properties of materials in hybrid electronics. Control of these interactions is essential for intentional formation or inhibition of processes on a surface. This study demonstrates the influence of surface loading and atomic-layer-deposited Al2O3 overlayers on the intermolecular interactions of a ZrO2-bound anthracene derivative, as observed through photophysical properties. The addition of ALD overlayers decreases excimer formation, but excimer features still dominate in the emission and transient absorption spectra.
Article
Chemistry, Multidisciplinary
Rachel A. A. Nye, Kaat Van Dongen, Jean-Francois de Marneffe, Gregory N. N. Parsons, Annelies Delabie
Summary: Area-selective deposition (ASD) has potential for sub-10 nm manufacturing, but scaling to ultrasmall dimensions and understanding feature-dependent nonuniformity and selectivity loss remains challenging. This work addresses these challenges by quantifying uniformity and selectivity for passivation/deposition/etch supercycles in 45 nm half-pitch TiN/SiO2 line/space patterns. Three selective processes were used: DMA-TMS inhibition, TiO2 ALD, and HBr/BCl3 plasma etch. By employing three supercycles, this work achieves 8 nm of TiO2 with high uniformity and selectivity, improving on previous reports in similar nanoscale patterns. Integrated consideration of uniformity and selectivity will aid the design of selective deposition processes for nanoscale electronic devices.
ADVANCED MATERIALS INTERFACES
(2023)
Article
Chemistry, Inorganic & Nuclear
Maksim Y. Livshits, Nikki J. Wolford, Jenny K. Banh, Molly M. MacInnes, Samuel M. Greer, J. S. R. Vellore Winfred, Kenneth Hanson, Thaige P. Gompa, Benjamin W. Stein
Summary: The experimental results of the study reveal the characteristics of different excited states in a series of TTA complexes. The excited state reactivity difference is summarized by constructing a Jablonski diagram. A computational framework is proposed for spectroscopic assignments and future studies.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Benjamin Sorenson, Kenneth Hanson
Summary: In spring 2020, the chemical education community faced a sudden transition to online classes and assessments. This study examines the impact of online exams on assessment quality and student performance in a General Chemistry II class. The results indicate that the quality of exams and student performance remained consistent regardless of in-person or online administration, and there was no evidence of increased cheating in online exams compared to in-person exams. Although these findings cannot be universally applied, they suggest that concerns about cheating in unproctored online exams may not be valid.
JOURNAL OF CHEMICAL EDUCATION
(2023)
Article
Chemistry, Multidisciplinary
Dhruba Pattadar, Ashley Arcidiacono, Drake Beery, Kenneth Hanson, S. Scott Saavedra
Summary: Self-assembly of molecular multilayers via metal ion linkages is an important strategy for interfacial engineering applications. In this study, the orientation of chromophores in a metal ion-linked trilayer was determined using UV-vis attenuated total reflection spectroscopy. The ATR approach allowed real-time monitoring of layer adsorption and detection of orientation changes. Transient absorption spectroscopy was also performed to study interlayer energy transfer dynamics.
Article
Chemistry, Physical
Scott McGuigan, Stephen J. Tereniak, Carrie L. Donley, Avery Smith, Sungho Jeon, Fengyi Zhao, Renato N. Sampaio, Magnus Pauly, Landon Keller, Leonard Collins, Gregory N. Parsons, Tianquan Lian, Eric A. Stach, Paul A. Maggard
Summary: This study presents a functional hybrid photocatalyst system using a crystalline carbon nitride semiconductor, poly(triazine imide) lithium chloride (PTI-LiCl), and a CoCl2(qpy-Ph-COOH) catalyst for CO2 reduction. The optimized catalyst loading achieved high rates and selectivity for CO production, which were further improved by increasing the incident irradiance. Higher surface loadings were found to extend the lifetime of the molecular catalysts.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Katrina G. Brathwaite, Quinton K. Wyatt, Amalie Atassi, Shawn A. Gregory, Eric Throm, David Stalla, Shannon K. Yee, Mark D. Losego, Matthias J. Young
Summary: This research investigates the electrochemical properties of PEDOT films and finds that film thickness plays an important role in the ordered structure and charge storage capacity. A 30 nm thick PEDOT film exhibits the highest face-on structure and the lowest charge storage capacity. Mixed domain films show higher charge storage capacity, likely due to the easier access of electrolyte to the edge region of PEDOT, facilitating faster ion transport.
Article
Chemistry, Physical
Vahid Rahmanian, Muhammed Ziauddin Ahmad Ebrahim, Seyedamin Razavi, Mai Abdelmigeed, Eduardo Barbieri, Stefano Menegatti, Gregory N. Parsons, Fanxing Li, Tahira Pirzada, Saad A. Khan
Summary: This study presents a novel method for synthesizing metal-organic frameworks (MOFs) on 3D-structured nanofibrous aerogels (NFAs). The resulting hybrid aerogels exhibit promising applications in CO2 adsorption, heavy metal removal, and antibacterial properties.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Physical
Sergey Yu. Ketkov, Sheng-Yuan Tzeng, Elena A. Rychagova, Anton N. Lukoyanov, Wen-Bih Tzeng
Summary: Metallocenes, including methylcobaltocene, play important roles in various fields of chemistry. The ionization energy and vibrational structure of (Cp ')(Cp)Co can be influenced by introducing methyl substituents. The mass-analyzed threshold ionization spectrum and DFT calculations provide accurate information about the properties and transformations of (Cp ')(Cp)Co.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Review
Chemistry, Physical
Qifeng Mu, Jian Hu
Summary: Polymer mechanochemistry has experienced a renaissance due to the rapid development of mechanophores and principles governing mechanochemical transduction or material strengthening. It has not only provided fundamental guidelines for converting mechanical energy into chemical output, but also found applications in engineering and smart devices.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Da Hye Yang, Francesco Ricci, Fredrik L. Nordstrom, Na Li
Summary: Through systematic evaluation of the oiling-out behavior of procaine, we identified both stable and metastable liquid-liquid phase separation, and established phase diagrams to assist in rational selection of crystallization strategies.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Vikki Anand Varma, Simmie Jaglan, Mohd Yasir Khan, Sujin B. Babu
Summary: Designing engineering structures like nanocages, shells, and containers through self-assembly of colloids is a challenging problem. This work proposes a simple model for the subunit, which leads to the formation of monodispersed spherical cages or containers. The model with only one control parameter can be used to design cages with the desired radius.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Hainan Jiang, Yaolong He, Xiaolin Li, Zhiyao Jin, Huijie Yu, Dawei Li
Summary: The cycling lifespan and coulombic efficiency of lithium-ion batteries are crucial for high C-rate applications. The Li-ion concentration plays a crucial role in determining the mechanical integrity and structural stability of electrodes. This study focuses on graphite as the working electrode and establishes an experimental system to investigate the mechanical properties of composite graphite electrode at different C-rates. Considering the effect of Li-ion concentration in stress analysis is found to be significant.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Zhiye Wang, Yunchuan Li, Mingjun Sun
Summary: This study investigates the influence of intramolecular pi-pi interactions on the electronic transport capabilities of molecules. By designing and analyzing three pi-conjugated molecules, the researchers observe that different pi-conjugated structures have varying effects on electron transport. The findings provide a theoretical foundation for designing single-molecule electronic devices with multiple electron channels based on intramolecular pi-pi interactions.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Yuandong Xu, Haoyang Feng, Chaoyang Dong, Yuqing Yang, Meng Zhou, Yajun Wei, Hui Guo, Yaqing Wei, Jishan Su, Yingying Ben, Xia Zhang
Summary: Hollow MoS2 cubes and spheres were successfully synthesized using a one-step hydrothermal method with the hard template method. The hollow MoS2 cubes exhibited higher specific capacitance and energy density compared to the hollow MoS2 spheres. The symmetrical supercapacitors assembled with these hollow structures showed good performance and high capacity retention after multiple cycles. These findings suggest that controlling the pore structure and surface characteristics of MoS2 is crucial for enhancing its electrochemical properties.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Ainhoa Oliden-Sanchez, Rebeca Sola-Llano, Joaquin Perez-Pariente, Luis Gomez-Hortiguela, Virginia Martinez-Martinez
Summary: The combination of photoactive molecules and inorganic structures is important for the development of advanced materials in optics. In this study, bulky dyes were successfully encapsulated in a zeolitic framework, resulting in emission throughout the visible spectrum.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Miaomiao Zhang, Cunyuan Pei, Qiqi Xiang, Lintao Liu, Zhongxu Dai, Huijuan Ma, Shibing Ni
Summary: The design of a solid electrolyte interphase (SEI) plays a crucial role in improving the electrochemical performance of anode materials. In this study, lithium difluoro(oxalate)borate (LiDFOB) is used as an electrolyte additive to form a protective SEI film on Li3VO4 (LVO) anodes. The addition of LiDFOB results in a dense, uniform, stable, and LiF-richer SEI, which enhances the Li-ion storage kinetics. The generated SEI also prevents further decomposition of the electrolyte and maintains the morphology of LVO anodes during charge/discharge processes. This work demonstrates the effectiveness of LiDFOB as a multi-functional additive for LiPF6 electrolytes and provides insights into SEI construction for high-performance LVO anodes.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
B. V. Andryushechkin, T. V. Pavlova, V. M. Shevlyuga
Summary: The atomic structure of the Ag(111)-p(4 x 4)-O phase was reexamined and two phases with the same periodicity were discovered. It was demonstrated that the accepted Ag6 model is incompatible with high-resolution oxygen-sensitive STM images.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
S. L. Romo-Avila, D. Marquez-Ruiz, R. A. Guirado-Lopez
Summary: In this study, we used density functional theory (DFT) calculations to investigate the interaction between model graphene oxide (GO) nanostructures and chlorine monoxide ClO. We aimed to understand the role of this highly oxidizing species in breaking C-C bonds and forming significant holes on GO sheets. Our results showed that C-C bonds in a single graphene oxide sheet can be broken through a simple mechanism involving the dissociation of two chemically attached ClO molecules. The formation of carbonyl groups and holes on the GO surface was also observed. This study provides important insights into the degradation of carbon nanotubes and the stability of GO during the myeloperoxidase (MPO) catalytic cycle.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Alberto Garcia-Fernandez, Birgit Kammlander, Stefania Riva, Hakan Rensmo, Ute B. Cappel
Summary: In this study, the X-ray stability of five different lead halide perovskite compositions (MAPbI3, MAPbCl3, MAPbBr3, FAPbBr3, CsPbBr3) was investigated using photoelectron spectroscopy. Different degradation mechanisms and resistance to X-ray were observed depending on the crystal composition. Overall, perovskite compositions based on the MA+ cation were found to be less stable than those based on FA+ or Cs+. Metallic lead formation was most easily observed in the chloride perovskite, followed by bromide, and very little in MAPbI3. Multiple degradation processes were identified for the bromide compositions, including ion migration, formation of volatile and solid products, as well as metallic lead. CsBr was formed as a solid degradation product on the surface of CsPbBr3.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Timofei Rostilov, Vadim Ziborov, Alexander Dolgoborodov, Mikhail Kuskov
Summary: The shock-loading behavior of nanomaterials is investigated in this study. It is found that shock compaction waves exhibit a distinct two-step structure, with the formation of faster precursor waves that travel ahead of the main compaction waves. The complexity of the shock Hugoniot curve of the tested nanomaterial is described, and the effect of initial porosity on the compressed states is demonstrated.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Sergey S. Nikitin, Alexander D. Koryakov, Elizaveta A. Antipinskaya, Alexey A. Markov, Mikhail V. Patrakeev
Summary: The stability of La1/3Sr2/3Fe1-xMnxO3-delta, a perovskite-type oxide, under reducing conditions is dependent on the manganese content. Increasing the manganese content leads to a decrease in stability. The behavior of iron and manganese in the oxide shows distinct differences, which can be attributed to the difference in the enthalpy of oxidation reactions. Additionally, the change in the La/Sr ratio affects the concentration of iron and manganese ions.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Mosayeb Naseri, Shirin Amirian, Mehrdad Faraji, Mohammad Abdur Rashid, Maicon Pierre Lourenco, Venkataraman Thangadurai, D. R. Salahub
Summary: Inspired by the successful transfer of freestanding ultrathin films of SrTiO3 and BiFeO3, this study assessed the structural stability and investigated the electronic, optical, and thermoelectric properties of a group of two-dimensional perovskite-type materials called perovskenes. The findings revealed that these materials are wide bandgap semiconductors with potential application in UV shielding. Moreover, they exhibit better electrical and thermal conductivity at high temperatures, enabling efficient power generation in thermoelectric devices.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)