Article
Chemistry, Multidisciplinary
Annamaria Panniello, Mariachiara Trapani, Massimiliano Cordaro, Carlo Nazareno Dibenedetto, Raffaele Tommasi, Chiara Ingrosso, Elisabetta Fanizza, Roberto Grisorio, Elisabetta Collini, Angela Agostiano, Maria Lucia Curri, Maria Angela Castriciano, Marinella Striccoli
Summary: Efficient FRET systems were developed by combining colloidal CdSe quantum dots (QDs) donors and BODIPY acceptors. The optimization of the distance between the organic fluorophore and the QDs through careful system engineering led to effective energy transfer in solution and solid state, with efficiencies reaching 76%. Deposition of QDs and dye as single coordinated units in solid state further increased efficiency by reducing the distance between the fluorophores to 2.2 nm, demonstrating the effectiveness of the coupling strategy.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Biochemistry & Molecular Biology
Kristyna Pavelicova, Lucie Vanickova, Yazan Haddad, Lukas Nejdl, Jan Zitka, Silvia Kociova, Filip Mravec, Tomas Vaculovic, Mirek Macka, Marketa Vaculovicova, Vojtech Adam
Summary: A new method for characterizing protein oligomerization based on FRET and capillary electrophoresis was reported, utilizing QDs and Cy3 as the donor-acceptor pair to study metallothionein dimer formation in the presence of Cd2+ ions. The successful monitoring and confirmation of MT dimer formation were achieved under aerobic conditions.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2021)
Article
Chemistry, Analytical
Nuo Duan, Kexin Ren, Mingqian Song, Xinyue Zhang, Zhouping Wang, Fei Jia, Shijia Wu
Summary: In this study, a dual-donor fluorescence resonance energy transfer (FRET) aptasensor was developed for simultaneous detection of histamine (HIS) and tyramine (TYR) using quantum dots and molybdenum sulfide nanosheets. The method showed good sensitivity and detection limits, and can be applied to the sensitive detection of biogenic amines in animal-derived foodstuff.
MICROCHEMICAL JOURNAL
(2023)
Article
Spectroscopy
Wenlu Wu, Zhongfei Hu, Cai Shi, Ruoqian Xu, Yiming Zhao, Yujie Ding
Summary: A Fe3+ optical sensor was developed by linking CdTe quantum dots and a Rhodamine B derivative using gamma-cyclodextrin as a bridge. The nanoprobe displayed a response to Fe3+ through a fluorescence resonance energy transfer process. The probe showed satisfactory linearity in the fluorescent quenching between 10 and 60 μM Fe3+ concentration, with a limit of detection of 2.51 μM. The probe was successfully used for the determination of Fe3+ in human serum with high sensitivity and exceptional selectivity.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Article
Engineering, Environmental
Dan Wang, Li-Jie Zhang, Ming-Hui Liu, Fang-Fang Du, Ze-Ya Shen, Longwei He, Li-Li Wang
Summary: A rhodamine-functionalized carbon dots (o -CDs-Rho) was synthesized and used for sensing UO22+ through an aggregation-enhanced FRET strategy. The weak FRET efficiency (16.2%) of o-CDs-Rho in dispersed solution is significantly enhanced (>77.2%) after UO22+ triggered aggregation. This is the first ratiometric fluorescence sensor with an inverse change of fluorescence intensity at dual emission wavelengths under single-wavelength excitation for UO22+.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Spectroscopy
Hongqiang Xu, Hailong Wang, Yixia Lu, Yanbo Zeng, Yiwen Yang, Zulei Zhang, Hongmei Wang, Xiao Wang, Lei Li
Summary: A rapid and simple fluorescence probe based on CeO2 quantum dots was developed for highly selective and ultrasensitive direct determination of 4-nitrophenol. The probe exhibited a broad linear response to 4-NP concentration and low detection limit, and was successfully applied in real water samples with spiked recoveries ranging from 98.2% to 102.4%.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2021)
Article
Engineering, Environmental
Bryan Parnitzke, Tochukwu Nwoko, Kate G. E. Bradford, Nethmi De Alwis Watuthanthrige, Kevin Yehl, Cyrille Boyer, Dominik Konkolewicz
Summary: The kinetics of photoinduced electron/energy transfer reversible addition fragmentation chain transfer (PET-RAFT) polymerization were investigated using a model system. Efficient PET-RAFT occurred under blue, violet, and green light, while minimal polymerization was observed under orange or red light. A universal scaling law was developed for Ir(ppy)3 and other energy transfer catalyzed PET-RAFT, allowing a description of polymerization across a range of light intensities, reaction conditions, and geometries.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Nanoscience & Nanotechnology
Paul Robineau, Jeremie Beal, Thomas Pons, Rodolphe Jaffiol, Cyrille Vezy
Summary: Micron-scale patterning of colloidal quantum dots is crucial for various applications. A new method is proposed to create micropatterns of QDs with high resolution using UV photolithography and silanization. The ability to bind proteins on the QDs surface opens up possibilities for biofunctionalization and nanoimaging.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Zhong Fu, Likuan Zhou, Yue Yin, Kangkang Weng, Fu Li, Shaoyong Lu, Dan Liu, Wenyong Liu, Longjia Wu, Yixing Yang, Haifang Li, Lian Duan, Hai Xiao, Hao Zhang, Jinghong Li
Summary: Researchers report a new method called light-triggered, carbocation-enabled ligand stripping (CELS) to pattern quantum dot light-emitting diodes (QLEDs) with high efficiency and stability. This method shows promising results for building high-performance QLED displays and related integrated devices.
Review
Chemistry, Multidisciplinary
Olanrewaju A. Aladesuyi, Thabang C. Lebepe, Rodney Maluleke, Oluwatobi S. Oluwafemi
Summary: Semiconductor nanomaterials, known as quantum dots (QDs), have attracted significant interest for their excellent optical properties and potential biomedical applications. However, the presence of toxic heavy metals in conventional QDs poses a major challenge. Ternary I-III-VI QDs have emerged as viable alternatives with tunable optical properties that emit in the near-infrared region. This review discusses the recent progress in using ternary QDs in applications such as Forster resonance energy transfer (FRET), nanomedicine, optical imaging, biosensing, and multimodal imaging. It also examines the pharmacokinetics, biodistribution, and toxicity concerns of these QDs, as well as the current status, challenges, and future directions in their application.
NANOTECHNOLOGY REVIEWS
(2022)
Article
Spectroscopy
Anmol Arora, Kriti Sharma, S. K. Tripathi
Summary: This study investigated the impact of luminescent MoSe2 quantum dots on trypsin activity and found that MoSe2 quantum dots formed a stable complex with trypsin through electrostatic interactions. This finding is significant for the development of trypsin detection methods and understanding the bioavailability of MoSe2 quantum dots in biological systems.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Article
Chemistry, Multidisciplinary
Cheng Yang, Hao Xie
Summary: This study demonstrates the interactions between carbon dots (CDs) and biomolecules through surface modification. Various fluorescence response behaviors of modified CDs were observed, with electrostatic attraction and hydrogen bonding playing important roles in inducing aggregation and fluorescence enhancement of CDs. The study also suggests the occurrence of an inner filter effect and selective antibacterial activity of modified CDs towards Gram-positive bacteria. This work provides potential for developing CD-based techniques for detecting and visualizing proteins/bacteria, as well as selective antibacterial agents.
Article
Chemistry, Multidisciplinary
Ling Xu, Shuai-Zheng Zhang, Wei Li, Zhan-Hui Zhang
Summary: A magnetic CdS quantum dot photocatalyst (Fe3O4/PDA/CdS) was synthesized from inexpensive starting materials using a convenient method. The catalyst showed high activity in amidation reactions of aromatic aldehydes under mild conditions using air as a clean oxidant. The catalyst could be easily recovered by magnetic separation and reused for multiple cycles without significant loss of catalytic activity.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Analytical
Chengquan Wang, Wuhao Zhang, Jing Qian, Li Wang, Yi Ren, Yu Wang, Mengqi Xu, Xingyi Huang
Summary: A novel fluorescence resonance energy transfer sensor based on aptamer recognition technology is proposed for the sensitive detection of AFB1 in moldy peanuts, using Ag nanocubes as energy acceptors and ZnS quantum dots as energy donors. The system shows a linear range of detection from 5 pg mL(-1) to 300 ng mL(-1) and a detection limit of 2.67 pg mL(-1). The specific binding of aptamer and complementary chain allows for fluorescence recovery of ZnS QDs in the presence of AFB1.
ANALYTICAL METHODS
(2021)
Article
Chemistry, Applied
Jiangkun Tan, Zan Li, Wen Yao, Zhongyin Ji, Zhiwei Sun, Jinmao You
Summary: A turn-on fluorescent sensor F671 was developed for the rapid, highly sensitive, and selective detection of phosgene. Furthermore, F671-embedded degreasing cotton was fabricated as a specific device for phosgene detection, displaying increasing emission intensity in the presence of phosgene through confocal imaging.
Article
Materials Science, Multidisciplinary
Jian-Xin Wang, Luis Gutierrez-Arzaluz, Jun Yin, Partha Maity, Yang Zhou, Cailing Chen, Yu Han, Osman M. Bakr, Mohamed Eddaoudi, Omar F. Mohammed
Summary: This study successfully addresses the challenge of regulating the luminescence of organic chromophores using external stimuli. By expanding the utility of oleic acid, the authors have developed a new and efficient luminescent regulator that can precisely control the emission colors from different electronic excited states. The findings have important applications in light-conversion devices, UV-light detection, and data encryption.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Wasim J. Mir, Ahmed Alamoudi, Jun Yin, Khursand E. Yorov, Partha Maity, Rounak Naphade, Bingyao Shao, Jiayi Wang, Muhammad Naufal Lintangpradipto, Saidkhodzha Nematulloev, Abdul-Hamid Emwas, Alessandro Genovese, Omar F. Mohammed, Osman M. Bakr
Summary: The use of zwitterionic lecithin ligands can stabilize the perovskite phase of CsPbI3 QDs for long periods, allowing LEDs fabricated with them to achieve record-breaking efficiency and brightness in the Rec. 2020 standard.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Arunachalam Sagadevan, Atanu Ghosh, Partha Maity, Omar F. Mohammed, Osman M. Bakr, Magnus Rueping
Summary: This study introduces a copper nanocluster-based catalyst that enables C-N bond-forming reactions of aryl chlorides under visible-light irradiation, showing good reaction yields.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Physical
Shanshan Zhang, Luis Gutierrez-Arzaluz, Jun Yin, Nimer Wehbe, Bingyao Shao, Rounak Naphade, Tengyue He, Partha Maity, Osman M. Bakr, Anton V. Malko, Omar F. Mohammed
Summary: By incorporating 5% of methylenediammonium dichloride (MDACl2), the density of iodide interstitials and surface recombination losses in mixed perovskite systems can be drastically reduced. This leads to photostable and ultra-low threshold amplified spontaneous emission (ASE) in cavity-free thin perovskite films. Additionally, an ultra-high optical gain of 1000 cm-1 is achieved, which is the highest reported for cavity-free perovskite films. These findings are supported by theoretical calculations and experimental measurements.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Partha Maity, Noor A. Merdad, Jehad K. El-Demellawi, Luis Gutierrez-Arzaluz, Zhixiong Liu, Rounak Naphade, Husam N. Alshareef, Osman M. Bakr, Omar F. Mohammed
Summary: In this study, the charge carrier dynamics at the interface between CsPbBr3 multiple quantum wells (MQWs) and TiO2 and Spiro-OMeTAD were investigated, and it was found that the charge carrier extraction occurred through a quantum tunneling effect. The impact of the barrier-thickness-dependent quantum tunneling effect on the photoelectric behavior of the synthesized QW photodetector devices was also studied.
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
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, 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.
Article
Materials Science, Multidisciplinary
Jehad K. El-Demellawi, Ahmed E. Mansour, Ahmed M. El-Zohry, Mohamed N. Hedhili, Jun Yin, Abdul-Hamid M. Emwas, Partha Maity, Xiangming Xu, Osman M. Bakr, Omar F. Mohammed, Husam N. Alshareef
Summary: Due to their impressive electronic/optoelectronic properties, MXenes have attracted significant attention among researchers in the field of 2D materials. In this study, a surface-termination-independent method was introduced to tune the work function (WF) of Ti3C2Tx MXene through molecular doping. The achieved discrete control over the WF opens up new possibilities for MXene-based devices.
ACS MATERIALS LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Xiao Xiao, Ivan Kurganskii, Partha Maity, Jianzhang Zhao, Xiao Jiang, Omar F. Mohammed, Matvey Fedin
Summary: Spiro rhodamine (Rho)-naphthalenediimide (NDI) electron donor-acceptor orthogonal dyads were prepared to generate a long-lived charge separation state based on the electron spin control approach, prolonging the lifetime of the charge separation state.
Article
Chemistry, Physical
Mohammad Z. Rahman, Partha Maity, Omar F. Mohammed, Jorge Gascon
Summary: Compared to crystalline carbon nitride, disordered carbon nitride performs poorly as a hydrogen production photocatalyst. The presence of reduced graphene oxide enhances its photocatalytic activity by suppressing recombination and enabling faster separation of charge carriers. The findings provide a proof-of-concept for overcoming recombination problems in disordered carbon nitride.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
