Article
Electrochemistry
Eftade Pinar Gur, Mesut Eryig, Uemit Demir
Summary: In this study, vertically aligned ZnO nanowalls decorated with electrochemically reduced graphene oxide (ERGO) structures were co-deposited directly on FTO substrates using a simple and one-pot electrochemical technique. These ERGO/ZnONWs were then co-sensitized with PbS and CdS quantum dots (QDs) using a successive ionic layer adsorption and reaction (SILAR) technique to fabricate ERGO/ZnONWs/PbS/CdS photoelectrodes. The photocurrent response of the ERGO/ZnONWs photoelectrodes was systematically investigated by varying the number of SILAR cycles for PbS and CdS. The PbS/CdS co-sensitized ERGO/ZnONWs photoelectrodes exhibited the best performance with high efficiency, open-circuit voltage, short-circuit current, and fill factor compared to other reported ZnO-based QDSSCs. The present study highlights the potential of the novel ERGO/ZnONWs/PbS/CdS photoanode and provides a simple and eco-friendly electrochemical technique for researchers interested in fabricating ERGO/ZnONWs for various applications.
ELECTROCHIMICA ACTA
(2023)
Article
Chemistry, Multidisciplinary
Zhu Meng, Benoit Mahler, Julien Houel, Florian Kulzer, Gilles Ledoux, Andrey Vasil'ev, Christophe Dujardin
Summary: The research found that in CdS/CdSe/CdS spherical quantum wells (SQWs) nanoscintillators, large-size SQWs can generate more excitons under X-ray excitation, but the increased Auger quenching effect makes large SQWs less effective in terms of timing performance.
Article
Chemistry, Physical
Shangrong Chen, Yang Peng, Changlin Li, Zhongyu Hou
Summary: The cascade structure of TiO2/CdS/CdSe semiconductor heterojunction, synthesized by a three-step hydrothermal growth technique, enhances photo-electrochemical performances by enlarging the absorption range of solar spectra, improving the properties of photogenerated charge carriers, and reducing interface resistance. The increase in hydrothermal growth time of CdSe leads to greater photoelectrochemical water splitting performances. The underlying physics mechanisms are discussed based on the formation of a type-II energy band alignment structure.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Materials Science, Multidisciplinary
Andrew A. Marder, James Cassidy, Dulanjan Harankahage, Jacob Beavon, Luis Gutierrez-Arzaluz, Omar F. Mohammed, Aditya Mishra, Austen C. Adams, Jason. D. Slinker, Zhongjian Hu, Stephen Savoy, Mikhail Zamkov, Anton V. Malko
Summary: Compared to zero-dimensional (0D) semiconductor quantum dots, 2D semiconductor nanoplatelets (NPLs) offer a spectrally narrow luminescence and superior absorption coefficients. However, optical devices based on NPLs still suffer from nonradiative Auger decay, which limits the efficiency of various processes. In this study, it is demonstrated that Auger recombination is strongly suppressed in spherically shaped nanoplatelets called quantum shells (QSs), leading to improved performance in terms of biexciton emission yield, amplified spontaneous emission, and electroluminescence enhancement. These results are significant for the development of solution-processed colloidal lasers and LEDs.
ACS MATERIALS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Marina Caretti, Elizaveta Mensi, Kessler Raluca-Ana, Linda Lazouni, Benjamin Goldman, Loi Carbone, Simon Nussbaum, Rebekah A. Wells, Hannah Johnson, Emeline Rideau, Jun-ho Yum, Kevin Sivula
Summary: Gas diffusion electrodes made from F-doped SnO2 coated SiO2 fiber felt substrates showed high porosity, roughness factor, and Young's Modulus. The conformal coating of FTO on the substrates allowed for the deposition of various semiconductors, resulting in comparable photoelectrochemical performance to flat FTO substrates. Gas phase H-2 production was achieved with a polymer semiconductor photocathode membrane assembly.
ADVANCED MATERIALS
(2023)
Article
Energy & Fuels
Bin Bin Jin, Xiao Jun Liu, Li Chun Dong, Xiang Xin Zhong, Ming Yan Liang, Jie Gan, Min Chen, Feng Guo
Summary: Researchers have developed a simple and rapid voltage-assisted SILAR technique (VASILAR) to more efficiently load CdS/CdSe QDs into TiO2 mesoporous films. The electric field generated by imposing the voltage promotes the preferential deposition of CdS in the deep region of the films, achieving a uniform distribution. Sufficient space and channels are created for the loading of CdSe, and the growth and distribution of CdSe are well regulated with the help of electric field forces. The resulting CdS/CdSe co-sensitized QDSSCs exhibit an outstanding efficiency of 5.7% and remarkable stability.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2023)
Article
Chemistry, Physical
Danja Fischli, Luisa Rieger, Klaus Boldt
Summary: Transition-metal-doped semiconductor nanocrystals have attracted interest in the field of spintronics. This paper presents a method for localized doping of CdSe/CdS dot-in-rods and investigates the interaction between dopants and excitons, as well as the kinetics of impurity diffusion.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Hui Zhang, Xiaohu Mi, Bowen Kang, Yunkai Wu, Tingting Zhang, Pai Liu, Xiaowei Sun, Zhenglong Zhang, Ning Liu, Hongxing Xu
Summary: Colloidal nanocrystals play a significant role in optoelectronic devices and their properties can be improved through ligand modification, which can enhance charge transport and emission characteristics in LEDs.
Article
Materials Science, Multidisciplinary
Ziheng Wang, Xueying Chu, Jinhua Li, Zhankun Weng, Mingze Xu, Yingjiao Zhai, Li Ma, Xiaojun Wang
Summary: In this study, ordered CdSe/CdS nanorod films were fabricated on an arbitrary substrate using the Langmuir-Blodgett technology, and polarization-sensitive photoluminescence was observed. The effect of the rod-like morphology and orderly arrangement of the nanorods on the band-edge exciton fine structure and polarized photons was discussed. When linearly polarized ultraviolet light was used as the excitation source, the photoluminescence intensity of the nanorod films periodically varied with the polarization direction of the UV light. The potential for low-cost polarization-sensitive devices using visible light charge-coupled device system was demonstrated by polarization-sensitive fluorescence excited by UV-polarized light.
Article
Engineering, Electrical & Electronic
Dongyang Wang, Hao Yang, Junhong Duan, Weiqing Liu, Huaming Wu
Summary: A novel photoanode based on CdSe/CdS@SnO2 core/shell nanoparticles was fabricated for highly efficient quantum dots and dye-sensitized tandem solar cells. The introduction of a SnO2 nanolayer in the CdSe/CdS@SnO2 at N719 device avoids quantum dots corrosion and collects electrons from surrounding N719 and CdSe/CdS core, transferring them to the front FTO electrode. Photovoltaic performance tests demonstrate the enhanced stability of the cell, with no attenuation in short-circuit current J(sc) and gradual increase in open-circuit voltage V-oc, resulting in improved photoelectric conversion efficiency. An optimal power conversion efficiency (PCE) of 5.43% is achieved for tandem solar cells.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Chemistry, Multidisciplinary
Ying Tang, Qilin Qin, Hongyu Yang, Shengnan Feng, Chunfeng Zhang, Jiayu Zhang, Min Xiao, Xiaoyong Wang
Summary: This study demonstrates the ability to decrease the Auger decay and radiative rates in semiconductor nanocrystals by applying external electric fields. The decrease in the Auger rate is attributed to enhanced exciton-exciton repulsion, while the decrease in the radiative rate is attributed to weakened electron-hole exchange interaction. These findings highlight the potential of using external electric fields as a post-synthetic approach to manipulate the exciton recombination dynamics in semiconductor nanocrystals.
Article
Chemistry, Physical
Ali Reza Amani-Ghadim, Mahtab Mousavi, Farzaneh Bayat
Summary: In this study, a novel sensitizer for QDSSCs was developed using CdTe@Dy-doped CdS core/shell quantum dots (QDs) cosensitized with CdSe QDs. The CdTe/CdS type-II core/shell structure QDs exhibited a wide absorption range, fast electron injection, and slower recombination rate.
JOURNAL OF POWER SOURCES
(2022)
Article
Chemistry, Multidisciplinary
Benjamin T. Diroll, James P. Cassidy, Dulanjan Harankahage, Muchuan Hua, Xiao-Min Lin, Mikhail Zamkov
Summary: This study investigates the two-photon properties of colloidal quantum shells, specifically the CdS/CdSe/CdS quantum shell samples. The results show that these quantum shells exhibit large non-linear absorption cross-sections and advantageous multiexciton physics. They have potential applications in upconversion imaging and can be utilized as excellent gain media for two-photon excitation. Additionally, quantum shell solids support multimodal amplified spontaneous emission due to their broad gain bandwidth and long gain lifetime.
Article
Chemistry, Physical
Zikun Tang, Yi Tao, Kanghong Wang, Dequan Bao, Zhenqiu Gao, Haiguang Zhao, Hao Zhang, Zhen Wen, Xuhui Sun
Summary: This study presents a unique synthetic approach to improve the transfer dynamics of photogenerated charges in heterostructured quantum dots (QDs) by incorporating metal ions (Mn2+) into the lattice during shell growth. The optimized QDs (Mn-0.03-CdSe/CdS) show a significantly higher saturated photocurrent density compared to undoped QDs (CdSe/CdS) under one sun illumination, attributed to the reduced conduction band offset and suppressed non-radiative recombination process of photogenerated charges introduced by Mn2+ ions. This work provides valuable guidance for enhancing the performance of optoelectronic devices based on heterostructured QDs.
Article
Nanoscience & Nanotechnology
Rinu Abraham Maniyara, Christina Graham, Bruno Paulillo, Yu Bi, Yu Chen, Gervasi Herranz, David E. Baker, Prantik Mazumder, Gerasimos Konstantatos, Valerio Pruneri
Summary: The study introduces a simple technique to reduce reflection in the near-infrared range for ITO and achieve high transmission with optimized parameters. This allows for high transmission at telecommunication wavelengths while maintaining high electrical conductivity.
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)