Article
Polymer Science
Zheng-Kai Huang, Yi-Kang Lan, Kun-Ta Lin, Chia-Hung Pan, Ching-Feng Wu, Horng-Long Cheng, Wei-Yang Chou, Jrjeng Ruan
Summary: The tuning of solvent composition can drive graphene sheets to scroll steadily in solutions, resulting in nanoscrolls and comb-like superstructures. The interlayer distance and curvature of central voids in these graphene nanoscrolls are influenced by the average radius of adsorbed molecular coils and the bending rigidity of graphene hexagonal structural units.
Article
Environmental Sciences
Peng Zhang, Yiran Wang, Pengni Li, Xiaomin Luo, Jianyan Feng, Hui Kong, Ting Li, Wenqi Wang, Xubing Duan, Ying Liu, Meng Li
Summary: A GO/Gr nanofiltration membrane with high stability was successfully engineered by post-hot-pressure treatment and forward pressure filtration. The membrane exhibited satisfactory permeability and selectivity, and showed high rejection rates for various solutes, demonstrating the potential of developing GO-based nanofiltration membranes.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Chemistry, Physical
Xiaoxiao Li, Xuefeng Tong, Qibin Chen, Honglai Liu
Summary: The size of graphene oxide sheets plays a crucial role in the enantioselectivity of membrane separation. Larger lateral size of GO sheets can result in better chiral separation performance. Functionalizing GO sheets with chiral selectors can enhance the enantiomer permeability and selectivity.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Chemistry, Physical
R. Arulmozhi, A. John Peter
Summary: The binding energies of intra- and interwell excitons in the CdS/CdSe/CdS asymmetric quantum well were studied by varying the size of the right well under the polaronic effect. Transition energy, transition lifetime, oscillator strength, and absorption coefficients were measured. The results showed that the peak absorption coefficient was larger for direct excitons compared to indirect excitons, with a longer radiative lifetime for the latter.
CHEMICAL PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Yan Zhang, Haibing Zhang, Dongdong Chen, Cheng-Jun Sun, Yang Ren, Jianhui Jiang, Linjun Wang, Zheng Li, Xiaogang Peng
Summary: Zinc-blende CdS nanoplatelets with atomically flat {100} basal planes terminated by either Cd or S atoms were synthesized, showing different band gaps and optical properties. By precisely controlling the surface structure, it is possible to engineer the spatial distribution of excitons, opening up new possibilities for semiconductor nanocrystals.
Review
Chemistry, Multidisciplinary
Ruijie Yang, Yingying Fan, Jinguang Hu, Zhangxin Chen, Hyeon Suk Shin, Damien Voiry, Qian Wang, Qingye Lu, Jimmy C. Yu, Zhiyuan Zeng
Summary: This article reviews the importance of atomically thin sheets in deciphering and mastering the electronic band structures and charge separation and transfer. It introduces the relevant physics, chemistry, and characterization techniques. Atomically thin sheets provide opportunities for atomic-level decoding and mastery of these photocatalytic phenomena.
CHEMICAL SOCIETY REVIEWS
(2023)
Article
Engineering, Environmental
Xin Xiang, Wenxuan Deng, Zhiyi He, Dongyun Chen, Najun Li, Qingfeng Xu, Hua Li, Jianmei Lu
Summary: In recent years, oil spills and the discharge of industrial organic wastewater have had a negative impact on society, economy, and the human environment. The complex composition of oily wastewater and the challenge of effectively separating oil and water have posed serious challenges to the scientific community. In this study, a graphene aerogel with magnetic oil-absorbing functionality was designed, which not only has emulsion-breaking functionality, but also can repeatedly adsorb organic pollutants. It exhibits a strong Fenton catalytic effect and effectively degrades pollutants, thus providing a novel insight into the treatment of oily wastewater.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Optics
V Blondot, C. Arnold, A. Delteil, D. Gerard, A. Bogicevic, T. Pons, N. Lequeux, J. P. Hugonin, J. J. Greffet, S. Buil, J. P. Hermier
Summary: We report the synthesis of hybrid light emitting particles with a diameter ranging from 100 to 500 nm, consisting of a compact CdSe/CdS/CdZnS semiconductor nanocrystal aggregate encapsulated by controlled nanometric size silica and gold layers. The addition of the gold nanoshell enhances the Purcell decay rate, as predicted by numerical simulations. Furthermore, we demonstrate the inhibition of Forster resonance energy transfer contribution.
Article
Optics
Qiuxiang Zhu, Weichu Xiao, Wenguo Li, Lincheng Zhang, Yaqi Deng, Xuejun Zhang, Zhengbo Jian, Xiuxiu Dong
Summary: Investigating the coupling mechanism between surface plasmons and excitons is crucial for achieving efficient and stable excitonic optoelectronic devices. By sputtering Au nanoparticles on CdS microbelts, the energy coupling effect mediated by surface plasmons was explored, leading to enhanced excitonic emission intensity and red-shift of peaks in Fabry-Perot resonant lasing spectra. The temperature-dependent photoluminescence analysis indicated that the optical phenomenon may be attributed to the exciton-phonon coupling.
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
Materials Science, Multidisciplinary
Xuyang Li, Zongxue Yu, Liangyan Shao, Xiaofang Feng, Haojie Zeng, Yuchuan Liu, Runxuan Long, Ximei Zhu
Summary: The research effectively addresses the issues of photocatalyst recovery and membrane fouling by synthesizing the NH2-MIL-88B(Fe)/CDs@GO material and obtaining a photocatalytic membrane. The composite photocatalytic membrane demonstrates excellent antifouling performance, stability, and self-cleaning property, which expands the application prospects for wastewater treatment.
Article
Chemistry, Physical
Matthew W. Brett, Liselotte C. Nass, Calum K. Gordon, Lara D. Browne, Bridget L. Stocker, Michael B. Price, Mattie S. M. Timmer, Nathaniel J. L. K. Davis
Summary: Photon multiplication is a promising approach for surpassing the theoretical limit of single-junction photovoltaic cells. This study focuses on singlet fission-based photon multipliers using tetracene chromophores and lead sulfide quantum dots. By controlling the design and synthesis of novel tetracene chromophores and the shelling of the quantum dots, significant improvements in photoluminescence efficiencies have been achieved. However, the wavelength dependence of the improved photoluminescence efficiency cannot be solely attributed to singlet fission.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Materials Science, Multidisciplinary
Alexander M. Smirnov, Anastasia D. Golinskaya, Vladimir N. Mantsevich, Maria Kozlova, Kseniia V. Ezhova, Bedil M. Saidzhonov, Roman B. Vasiliev, Vladimir S. Dneprovskii
Summary: Experimental investigations were conducted on the transient absorption of colloidal heterostructured CdSe/CdS nanoplatelets under high-intensity nanosecond laser pulses, revealing a strong dependence on nanoplatelets concentration and pump intensities. Nonlinear transmission changes in nanoplatelets solutions were explained by various factors, and the identification of conditions for optical gain in colloidal solutions was a significant result.
RESULTS IN PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Xiao Wang, Ruojie Sha, William B. Knowlton, Nadrian C. Seeman, James W. Canary, Bernard Yurke
Summary: A chiral dimer of an organic semiconductor was created by assembling an octamer of polyaniline with DNA. The dimer showed easy reconfiguration between its monomeric and dimeric forms. Experimental and theoretical studies were conducted to examine the dimer's geometry and the exciton coupling between its molecules. Protonic doping allowed for easy switching between different electronic states, and the dimer exhibited a Davydov splitting similar to DNA-dye systems with strong transition dipoles. This research provides a possible platform for studying the fundamental properties of organic semiconductors with DNAtemplated assemblies, which have potential applications in artificial light-harvesting systems and excitonic devices.
Article
Engineering, Chemical
Nozha M. Sawan, Abeer A. Alshami, Alhanoof Aldegheishem, Eman Alsagob
Summary: This study aimed to modify orthodontic adhesive using graphene sheets decorated with silver nanoparticles (Ag-GS) in order to examine their mechanical and antibacterial properties after bonding with orthodontic brackets. The results showed that the improved adhesive with 0.35 wt% Ag-GS significantly enhanced the antibacterial capability and had no cytotoxicity effect on cells after 72 hours. It also showed promising results for bonding orthodontic brackets to enamel.
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
(2022)
Article
Chemistry, Multidisciplinary
Mihir Manna, Tushar Debnath, Satyapriya Bhandari
Summary: In this study, a white light emitting nanocomposite was constructed by chemically coupling halide perovskite nanocrystals with a metal quinolate complex. The coupling process did not affect the morphology, size, and dopant oxidation state of the nanocrystals, while providing additional environmental stability. The resulting nanocomposite exhibited bright white light emission properties close to those of midday sunlight.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Mihir Manna, Srimanta Pal, Tanmay Goswami, Satyapriya Bhandari, Tushar Debnath
Summary: The choice of surface functionalized ligands is crucial in tailoring the optoelectronic properties of semiconductor nanocrystals. In this study, we used a small bidentate molecule called 8-hydroxyquinoline (HQ) to functionalize CsPbX3 perovskite nanocrystals (X = Cl, Br, I). Our experimental results revealed a halogen-hydrogen bonding formation in HQ-functionalized CsPbCl3 and CsPbBr3 nanocrystals, enabling fast charge transfer from the nanocrystals to the HQ molecule within 540 fs. However, weak chelation was observed in HQ-coupled CsPbI3 nanocrystals without an active charge transfer process. The understanding of these distinct surface coupling mechanisms has significant implications in the development of optoelectronics.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Multidisciplinary Sciences
Yannan Liu, Cheng-Hao Liu, Tushar Debnath, Yong Wang, Darius Pohl, Lucas V. Besteiro, Debora Motta Meira, Shengyun Huang, Fan Yang, Bernd Rellinghaus, Mohamed Chaker, Dmytro F. Perepichka, Dongling Ma
Summary: Integrating plasmonic nanoparticles into the metal-organic matrix allows for enhanced plasmonic near field effect, increased light absorption, and accelerated charge carrier separation. In this study, a one-step synthesis approach is used to create a junction with an intimate interface between plasmonic Ag nanoparticles and a matrix with silver nodes. The plasmonic effect of Ag nanoparticles on the matrix is visualized, and the transfer of charge carriers from the nanoparticles to the matrix is verified. This system demonstrates highly efficient visible-light photocatalytic H-2 generation, surpassing other metal-organic framework-based photocatalytic systems. This research provides insights into effective electronic and energy bridging between plasmonic nanoparticles and organic semiconductors.
NATURE COMMUNICATIONS
(2023)
Editorial Material
Chemistry, Physical
Jordi Cabana, Thomas Alaan, George W. Crabtree, Po-Wei Huang, Akash Jain, Megan Murphy, Jeanne N'Diaye, Kasinath Ojha, George Agbeworvi, Helen Bergstrom, Simon Gersib, Hassan Harb, Adrien Stejer, Genesis Quiles-Galarza, Oliver Rodriguez, Isabella Caruso, Josue M. Goncalves, Grace Y. Chen, Carlos A. Fernandez, Hanqing Pan, Kabian Ritter, Yingjie Yang, Haozhe Zhang, Ana Cristina Garcia-Alvarez, Stefan Ilic, Khagesh Kumar, Rachel Silcox, Yu Yao, Hakhyeon Song, Stoyan Stoyanov, Mohit Saraf, Celine H. Chen, S. M. Supundrika Subasinghe, Reginaldo Gomes, Shuangyan Lang, Eamonn Murphy, Arashdeep Singh Thind, Yu Zheng
ACS ENERGY LETTERS
(2023)
Article
Chemistry, Physical
Avik Das, Tushar Debnath
Summary: Controlling light reabsorption in emitting materials is crucial for improving the performance of light-emitting devices. In this study, we prepared a series of size-dependent Cs(Mn/Pb)Cl-3 alloy nanoplatelets with a significant enhancement in the exciton Stokes shift. By utilizing an interfacial Mn-alloying process, we achieved a large exciton Stokes shift of 600 meV in 2 ML Cs(Mn/Pb)Cl-3 NPls. We also proposed a model based on the charge transfer process between Mn2+ and Mn3+ to explain the observed phenomenon.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Jiawei Huang, Checkers R. Marshall, Kasinath Ojha, Meikun Shen, Stephen Golledge, Kentaro Kadota, Jacob McKenzie, Kevin Fabrizio, James B. Mitchell, Faiqa Khaliq, Audrey M. Davenport, Michael A. LeRoy, Ashley N. Mapile, Tekalign T. Debela, Liam P. Twight, Christopher H. Hendon, Carl K. Brozek
Summary: Redox intercalation is widely used in energy storage, electrocatalysis, sensing, and optoelectronics. The authors report that Fe(1,2,3-triazolate)2 exhibits an intercalation-based redox process shifted ca. 1.2 V from redox at the particle surface. They identify a distinct and highly reversible Fe2+/Fe3+ redox event occurring within the MOF interior and demonstrate the possibility of tuning electrode potentials by over a volt. This study provides insights into ion-intercalation redox chemistry in nanoconfined environments and has implications for energy capture and storage technologies.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Ren-Wu Huang, Xin Song, Shulin Chen, Jun Yin, Partha Maity, Jiayi Wang, Bingyao Shao, Hongwei Zhu, Chunwei Dong, Peng Yuan, Taimoor Ahmad, Omar F. F. Mohammed, Osman M. M. Bakr
Summary: Zero-dimensional (0D) scintillation materials are of great interest for the fabrication of flexible high-energy radiation scintillation screens. Challenges still persist in the development of 0D scintillators, but a strategy based on metal nanoclusters shows promise in overcoming these limitations. This work demonstrates the synthesis and self-assembly of atomically precise nanoclusters with high phosphorescence quantum yield, AIEE behavior, and intense radioluminescence. The self-assembled nanoclusters can be used as building blocks for flexible particle-deposited scintillation films with high-resolution X-ray imaging performance.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Nanoscience & Nanotechnology
Noor A. Merdad, Yue Wang, Omar Alkhazragi, Zyad O. F. Mohammed, Partha Maity, Luis Gutierrez-Arzaluz, Haoze Yang, Rounak Naphade, Chun Hong Kang, Tien Khee Ng, Osman M. Bakr, Boon S. Ooi
Summary: In this study, the authors fabricated cesium lead bromide (CsPbBr3) thin films of varying thicknesses and investigated their visible-light communication (VLC) performance. Thicker films were found to have a more homogeneous surface and fewer surface trap states than thinner films. The 20-nm-thick CsPbBr3 film exhibited the best performance with a -3-dB bandwidth of 30.7 MHz and a net data rate of 330 Mb/s, making it suitable for high-power, high-speed, and large-area transmission and detection of visible-light signals.
Article
Optics
Soumik Siddhanta, Andrey N. Kuzmin, Artem Pliss, Alexander S. Baev, Sunil K. Khare, Pramit K. Chowdhury, Ashok K. Ganguli, Paras N. Prasad
Summary: This review provides a historical account of the evolution of Raman spectroscopy and discusses advancements that have allowed for the detection of single molecules and non-invasive analysis of organelles. It addresses the need for a consolidated overview of Raman spectroscopy's broad applications in biosensing, from fundamental biology to disease identification, drug screening, and quality control in food and agriculture. The review also highlights the convergence of Raman spectroscopy with bioanalysis, agriculture, and food quality control, and explores the potential of combining advanced spectroscopy with machine-learning algorithms to establish a new field known as Ramanomics. Future needs and opportunities are also discussed.
ADVANCES IN OPTICS AND PHOTONICS
(2023)
Article
Materials Science, Multidisciplinary
Nikita Kolobov, Abdelali Zaki, Katarzyna Swirk, Partha Maity, Luis Garzon-Tovar, Giasemi K. Angeli, Alla Dikhtiarenko, G. Delahay, Pantelis N. Trikalitis, Abdul-Hamid Emwas, Amandine Cadiau, Omar F. Mohammed, Christopher H. Hendon, Karim Adil, Jorge Gascon
Summary: Despite efforts to develop efficient Ti-based metal-organic framework (MOF) photocatalysts, MIL-125-NH2 remains the benchmark, and few design principles have been offered to improve photocatalytic performance. Linker functionalization in Ti MOFs has been shown to enhance photocatalysis under visible light by closing the electronic band gap and improving charge carrier lifetimes. The role of node nuclearity and topology on photocatalytic activity in known Ti-based MOFs is still unclear. Here, we report a new MOF, ICGM-1, with a 3D-connected framework featuring 1D Ti-O rods. Photocatalytic hydrogen evolution experiments reveal a significant difference in activity, solely attributed to node geometry. Time-resolved spectroscopy and DFT calculations explain these differences in terms of electronic and geometric properties, paving the way for the development of Ti-MOF photocatalysts.
ACS MATERIALS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Xi Chen, Noreen Rehmat, Ivan V. Kurganskii, Partha Maity, Ayhan Elmali, Jianzhang Zhao, Ahmet Karatay, Omar F. Mohammed, Matvey V. Fedin
Summary: Bodipy (BDP)-perylenebisimide (PBI) donor-acceptor dyads/triad were synthesized to investigate the spin-orbit charge-transfer intersystem crossing (SOCT-ISC). Different quantum yields of singlet oxygen were observed for the dyads/triad, and various processes including FRET, CS, CR, and TTET were observed in the excited state dynamics. Time-resolved electron paramagnetic resonance spectroscopy revealed the involvement of both radical pair ISC and SOCT-ISC in the intersystem crossing. The triad BDP-PBI-2 showed an unusual electron spin polarization pattern of (e, e, e, e, e, e) in the triplet state formed via the RP ISC mechanism.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Materials Science, Multidisciplinary
Partha Maity, Rounak Naphade, Luis Gutierrez-Arzaluz, Sarvarkhodzha Nematulloev, Simil Thomas, Wasim J. Mir, Khursand E. Yorov, Husam N. Alshareef, Osman M. Bakr, Omar F. Mohammed
Summary: Halide perovskite colloidal nanocrystals (NCs) have been modified with a rhodamine 6G (Rh6G) hybrid assembly to promote prolonged charge separation. The study combines spectroscopy methods with calculations to explore the excited-state interaction in these NCs. The results reveal the dimerization of Rh6G at low concentrations, and the binding of Rh6G on the NC surface is confirmed. Transient absorption spectroscopy shows electron transfer from Rh6G to CsPbI3 NCs and energy transfer from CsPbBr3 to Rh6G, highlighting practical approaches for studying excited-state interaction.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Physical
Mihir Manna, Srimanta Pal, Tanmay Goswami, Satyapriya Bhandari, Tushar Debnath
Summary: The choice of surface functionalized ligands is crucial for tailoring the optoelectronic properties of semiconductor nanocrystals (NCs). We used a bidentate 8-hydroxyquinoline (HQ) molecule to surface functionalize CsPbX3 perovskite NCs (X = Cl, Br, I), along with traditional long-chain monodentate ligands. Our experimental results revealed a halogen-hydrogen bonding formation in the HQ functionalized CsPbCl3 and CsPbBr3 NCs, which facilitated fast charge transfer from the NCs to the HQ molecule. In contrast, weak chelation was observed in HQ-coupled CsPbI3 NCs without an active charge transfer process.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Wasim J. Mir, Tariq Sheikh, Saidkhodzha Nematulloev, Partha Maity, Khursand E. Yorov, Abdul-Hamid Emwas, Mohamed Nejib Hedhili, Mudeha Shafat Khan, Mutalifu Abulikemu, Omar F. Mohammed, Osman M. Bakr
Summary: This study reports a method for synthesizing high-quality and size-tunable InSb CQDs using commercially available precursors and under standard colloidal synthesis conditions. By changing the surface ligands of the CQDs, an increase in excited-state lifetime, efficient carrier multiplication, and slower carrier annihilation are observed. This work overcomes a major challenge in synthesizing high-quality InSb CQDs and opens up new possibilities for Pb- and Hg-free CQDs in SWIR applications.
Article
Chemistry, Multidisciplinary
Tariq Sheikh, Wasim J. Mir, Saidkhodzha Nematulloev, Partha Maity, Khursand E. Yorov, Mohamed Nejib Hedhili, Abdul-Hamid Emwas, Mudeha Shafat Khan, Mutalifu Abulikemu, Omar F. Mohammed, Osman M. Bakr
Summary: InAs colloidal quantum dots (CQDs) have emerged as candidate lead- and mercury-free solution-processed semiconductors for infrared technology due to their appropriate bulk bandgap and promising charge-carrier transport properties. However, the lack of suitable arsenic precursors and readily accessible synthesis conditions have limited their size and bandgap range. By controlling the reactivity, we have successfully synthesized monodisperse InAs nanorod CQDs with tunable bandgaps.
