Article
Materials Science, Multidisciplinary
Alexey S. Lipatiev, Georgiy Yu Shakhgildyan, Maxim P. Vetchinnikov, Hojeong Lee, Jong Heo, Sergey Lotarev, Vladimir N. Sigaev
Summary: In this study, the structure of microdomains containing CdS nanoparticles in glass written by laser was examined using transmission electron microscopy. CdS nanocrystals had a size distribution with multiple peaks, with quantum dots of minimal size near the edges. The CdS nanocrystals showed a significant increase in size from the periphery to the center of the laser-written microdomain, with potential applications in advanced optical data encoding and security tagging.
Article
Energy & Fuels
Byung Gi Kim, Duong Nguyen Nguyen, Woongsik Jang, Jung Kyu Kim, Dong Hwan Wang
Summary: In this study, the addition of silver-doped carbon quantum dots (Ag-CQDs) to the PEDOT:PSS hole transport layer was shown to enhance the performance of hybrid PSCs by improving charge extraction and increasing electrical conductivity. The one-step hydrothermal synthesis of Ag-CQDs in the presence of a nitrogen-containing carbon precursor facilitated the incorporation of these nanoparticles into the PSCs, resulting in increased short circuit current density and overall device performance. The improved properties of PEDOT:PSS with Ag-CQDs led to more efficient hole extraction and enhanced perovskite crystallinity, ultimately leading to more stable and durable PSCs with improved charge dynamics.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Chemistry, Multidisciplinary
Muhammad Haroon Rashid, Ants Koel, Toomas Rang, Nadeem Nasir, Nadeem Sabir, Faheem Ameen, Abher Rasheed
Summary: Quantum-dot-based core/shell structures have gained significance recently due to their optical, optoelectronic, and magnetic attributes. This study developed novel Cu-doped CdS/ZnS shell structures to enhance photoluminescence properties. Experimental results showed that Cu-doped ZnS shells adopted the crystal structure of CdS, minimizing lattice mismatch and offering better passivation, resulting in increased photoluminescence.
Article
Materials Science, Multidisciplinary
J. I. Contreras-Rascon, J. Diaz-Reyes, A. Flores-Pacheco, R. Lozada Morales, M. E. Alvarez-Ramos, J. A. Balderas-Lopez
Summary: This work investigates the modifications of the crystalline structure and properties of nanostructured cadmium sulphide (CdS) thin films by introducing gold quantum dots to form a hybrid metal-semiconductor system. Various characterization techniques such as XPS, XRD, and TEM were used to study the structural changes, showing a significant impact on properties in the CdS-Au samples, indicating a strong quantum confinement effect.
RESULTS IN PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Katherine E. Shulenberger, Sophie C. Coppieters 't Wallant, Megan D. Klein, Alexandra R. McIsaac, Tamar Goldzak, David B. Berkinsky, Hendrik Utzat, Ulugbek Barotov, Troy Van Voorhis, Moungi G. Bawendi
Summary: A spectrally resolved correlation method was developed to study the triply excited state, enabling direct measurements of the recombination pathway for the triexciton. It was found that for core-shell CdSe-CdS nanocrystals, triexciton emission arises exclusively from the band-edge S-like state. Time-dependent density functional theory and extended particle-in-a-sphere calculations show that reduced carrier overlap induced by the core-shell heterostructure can account for the lack of emission observed from the P-like state. These results provide insights for potential control of nanocrystal luminescence using core-shell heterostructures.
Article
Chemistry, Physical
Piyali Maity, Shiv Kumar, Ravi Kumar, S. N. Jha, D. Bhattacharyya, S. R. Barman, Sandip Chatterjee, Bhola N. Pal, Anup K. Ghosh
Summary: In this study, monodispersed and environmentally stable cobalt-doped CdS quantum dots were successfully synthesized and characterized for potential use in thin film optoelectronic devices. Analysis revealed the creation of a new doping band near the NIR region in the Co-doped CdS QDs, leading to enhanced photoconductivity and promising potential for UV-vis/NIR thin film optoelectronic devices.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Analytical
Hongyi Li, Xiaokun Wen, Yadan Ding, Guorui Wang, Hancheng Zhu, Junping Liu, Huiying Zhao, Xia Hong
Summary: A dual-mode immunoassay strategy based on CdS nanoparticles was developed, which has both photoluminescent and multi-phonon resonance Raman scattering properties. This strategy enables sensitive and specific detection of human immunoglobulin G (HIgG). It demonstrates advantages in detection sensitivity and working range compared to previous methods, with good stability and repeatability.
Article
Materials Science, Ceramics
E. Kolobkova, M. S. Kuznetsova, N. Nikonorov
Summary: CsPbX3 (X=Cl, Br, I) nanocrystals were successfully synthesized in fluorophosphate glasses for the first time, with controlled formation through adjustment of cooling rate and heat treatment conditions. The X-ray diffraction data and optical measurements confirmed the formation of 4-11 nm sized CsPbX3 nanocrystals, with the presence of two narrow bands in the luminescence spectra due to the introduction of two anions complicating the preparation process. The CsPb(Cl, Br)3 quantum dots exhibited high intensity photoluminescence with a quantum yield of 45-50% and narrow emission band.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Materials Science, Ceramics
Rongqing Jiang, Hanwei Wu, Kai Li, Wenchao Zhang, Yunlan Guo, Jing Wang, Chao Liu
Summary: In this study, the influence of Na2O concentration on the precipitation of CdSe quantum dots (QDs) in glasses is investigated. It is found that higher Na2O concentration leads to decreased connectivity and solubility of Se in the glass, resulting in the formation of Se-related clusters and lower temperature for the precipitation of CdSe QDs. In glasses with lower Na2O concentration, defect-related photoluminescence (PL) is suppressed and the overall PL changes from dual band to narrow band with tunable wavelength in the visible range. Glasses with higher Na2O concentration only exhibit dual band PL due to phase separation during high temperature heat-treatment. These results demonstrate that the PL properties of QDs in glasses can be modulated by adjusting the glass composition and structure.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Biochemical Research Methods
Olga A. Goryacheva, K. David Wegner, Aleksandr M. Sobolev, Ines Haeusler, Nikolai Gaponik, Irina Y. Goryacheva, Ute Resch-Genger
Summary: Light-emitting nanoparticles, known as quantum dots (QDs), have great potential for biosensing and bioimaging applications. However, their use in biological systems requires them to be water-dispersible without affecting their optical properties. In this study, researchers developed a new surface silanization method to preserve the optical properties of QDs and successfully prepared water-dispersible QDs.
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2022)
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
Chemistry, Physical
Juan Yang, Pei Li, Zailing Song, Jie Li, Huan Yang, Fan Yan, Lu Li, Can Xu, Junlang Chen, Liang Chen
Summary: In this study, graphene quantum dots (GQDs) modified by scandium ions (Sc3+) were prepared to improve their photoluminescence (PL) properties in aqueous solution containing heavy metal ions. It was found that GQDs modified by other metal ions, such as aluminum (Al3+) and gallium (Ga3+), also exhibited similar results, confirming the universality of this approach.
APPLIED SURFACE SCIENCE
(2022)
Article
Engineering, Electrical & Electronic
Ha Thanh Tung, Dang Huu Phuc
Summary: In this study, photovoltaic devices based on CdS/CdSe multilayer photoanodes were fabricated with Mn2+ ions doped into CdS or CdSe quantum dots. The optimal performance was achieved with a 30% Mn2+ doping concentration and a thickness of CdSe:Mn2+ film at 3 cycles, resulting in an efficiency of 3.9%.
OPTICAL AND QUANTUM ELECTRONICS
(2021)
Article
Chemistry, Physical
Koichiro Suzuki, Toshihiro Kuzuya, Yasushi Hamanaka
Summary: Surface modification plays a crucial role in improving fluorescence properties of semiconductor nanoparticles. The bandedge emission characteristic has been observed in AgInS2 NPs but not in most other I-III-VI2 NPs. In this study, luminescence modifications of CuInS2 NPs were examined after postsynthesis treatment with TOP ligands. Although the bandedge emission was not generated, the TOP treatment significantly improved the luminescence quantum yield.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
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
Materials Science, Multidisciplinary
Kai Xu, David A. Pierce, Pavel Hrma, Michael J. Schweiger, Albert A. Kruger
JOURNAL OF NUCLEAR MATERIALS
(2015)
Article
Materials Science, Ceramics
Shixun Dai, Changgui Lin, Feifei Chen, Xianghua Zhang, Chao Liu, Kai Xu, Jong Heo, Xiang Shen, Xunsi Wang
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2011)
Article
Materials Science, Ceramics
Tiefeng Xu, Feifei Chen, Shixun Dai, Xiang Shen, Xunsi Wang, Qiuhua Nie, Chao Liu, Kai Xu, Jong Heo
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2011)
Article
Materials Science, Ceramics
Xiang Shen, Feifei Chen, Xin Lv, Shixun Dai, Xunsi Wang, Wei Zhang, Baoan Song, Tiefeng Xu, Qiuhua Nie, Chao Liu, Kai Xu, Jong Heo
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2011)
Article
Materials Science, Ceramics
Xunsi Wang, Baoan Song, Wei Zhang, Dai Shixun, Guoxiang Wang, Tiefeng Xu, Xiang Shen, Xianghua Zhang, Chao Liu, Kai Xu, Jong Heo
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2011)
Article
Materials Science, Ceramics
Kai Xu, Chao Liu, Shixun Dai, Xiang Shen, Xunsi Wang, Jong Heo
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2011)
Article
Materials Science, Ceramics
Kai Xu, Jong Heo
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2012)
Article
Materials Science, Ceramics
Kai Xu, Jong Heo
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2013)
Article
Materials Science, Ceramics
Kai Xu, Jong Heo
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2014)
Article
Materials Science, Multidisciplinary
Kai Xu, Pavel Hrma, Wooyong Um, Jong Heo
JOURNAL OF NUCLEAR MATERIALS
(2013)
Article
Materials Science, Ceramics
Kai Xu, Jong Heo
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2012)
Article
Materials Science, Ceramics
Kai Xu, Jong Heo
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2013)
Article
Optics
Feifei Chen, Shixun Dai, Tiefeng Xu, Xiang Shen, Baoan Song, Changgui Lin, Xunsi Wang, Chao Liu, Kai Xu, Jong Heo
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2011)
Article
Materials Science, Ceramics
Kai Xu, Pavel Hrma, Jarrett Rice, Brian J. Riley, Michael J. Schweiger, Jarrod V. Crum
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2015)
