Article
Chemistry, Analytical
Luping Tang, Yangyang Zhang, Chen Liao, Yingqing Guo, Yingtao Lu, Yixuan Xia, Yiwei Liu
Summary: In this study, the temperature-dependent photoluminescence (PL) properties of CdS/ZnS core/shell quantum dots (QDs) were investigated. The results showed that the band-edge emission (BEE) intensity decreased with increasing temperature, while the surface-state emission (SSE) intensity first increased and then decreased. The PL spectra exhibited a redshift in peak energies and an increase in full width at half-maximum (FWHM) as the temperature increased. Furthermore, the CIE chromaticity coordinates showed a dramatic change with temperature. These findings suggest that CdS/ZnS core/shell QDs have potential applications as temperature sensors.
Article
Chemistry, Physical
Yuping Xu, Peisen Zhang, Shuming Jin, Chuang Liu, Lin Yang, Zhuo Ao, Meng Qin, Kaili Nie, Yi Hou, Mingyuan Gao
Summary: Plastic pollution is a significant issue that harms the ecosystem and human health. This study presents an innovative approach to optically track degraded microplastics using a model system composed of poly(L-lactic acid) and CuInS2@ZnS quantum dots. The results demonstrate that the microplastics are mainly absorbed by Gram-positive cocci.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Liwei Dai, Christian Strelow, Tobias Kipp, Alf Mews, Iris Benkenstein, Dirk Eifler, Thanh Huyen Vuong, Jabor Rabeah, James McGettrick, Rostyslav Lesyuk, Christian Klinke
Summary: This study presents the successful direct doping of Mn2+ ions into ZnS nanoplatelets using a nucleation-doping strategy, resulting in Mn luminescence in ZnS:Mn NPLs. Energy transfer from ZnS NPLs to Mn2+ ions was observed, and the impact of Mn concentration on optical properties was systematically investigated. Tunable Mn emission and enhanced PL quantum yield in ZnS:Mn NPLs were achieved by passivating surface trap states. The synthetic strategy introduced here opens up new possibilities for further doped systems of two-dimensional NPLs.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Analytical
Shuangtian Dong, Dongyang Wang, Xuwen Gao, Li Fu, Jingna Jia, Yuqi Xu, Bin Zhang, Guizheng Zou
Summary: This study proposes a method to achieve chemiluminescence with different wavelengths and intensities by adjusting triggering agents, which shows promising potential for applications in immunoassays and other fields.
ANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Physical
Xiaoyan Li, Chaojin Xuan, Boxu Yang, Weichen Wang, Mingzhong Wang, Xiaopeng Zhao
Summary: In this paper, center-doped monodisperse Cu-doped ZnSe (ZnSe:Cu) quantum dots are synthesized by co-nucleation doping method, and then a double-layered ZnS shell is grown on the QDs. The prepared ZnSe:Cu/ZnS/ZnS QDs exhibit high photoluminescence intensity and excellent stability in the blue region. The stability is attributed to the ZnS shell grown outside the ZnSe:Cu core, which effectively limits excitons and Cu and isolates O2. This work provides a new approach to enhance the stability of quantum dots.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
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
Engineering, Electrical & Electronic
Yuan Liu, Cong Zhao, Jingzhou Li, Shixi Zhao, Xiaomin Xu, H. Y. Fu, Cunjiang Yu, Feiyu Kang, Guodan Wei
Summary: The high-performance photodetectors based on environmentally benign CuInS2/ZnS core-shell quantum dots, in combination with organic blend films, achieve efficient energy transfer and charge separation, leading to low dark current and high detectivity. This work demonstrates a feasible strategy to develop highly sensitive photodetectors using heavy-metal-free core-shell quantum dots.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Chemistry, Analytical
Zhipeng Li, Xunxun Deng, Shuo Wu, Shuangtian Dong, Guizheng Zou
Summary: A near-infrared (NIR) aqueous chemiluminescence (CL) strategy using CuInS2@ZnS nanocrystals (CIS@ZnS NCs) was proposed, achieving efficient NIR CL and successfully applied in constructing biosensors, indicating its promising potential for bioassays.
ANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Li Jun Lim, Xiaofei Zhao, Zhi-Kuang Tan
Summary: This work presents a facile synthesis method for near-infrared (NIR) emitting CuInS2/ZnS quantum dots (QDs). By using two sulfur precursors, 1-dodecanethiol (DDT) and hexamethyldisilathiane (HMDS), the reactive HMDS promotes faster nucleation and leads to a higher density of Cu-deficiency sites, resulting in QDs with high photoluminescence quantum efficiency (PLQE) of 65% at a long emission wavelength of 920 nm. NIR light-emitting diodes (LED) fabricated using these QDs achieve an external quantum efficiency (EQE) of 8.2%, comparable to the best reported PbS and InAs QD LEDs, and with an emission wavelength surpassing that of lead iodide perovskites. This work represents one of the first efficient NIR LEDs based on environmentally benign CuInS2 QDs, potentially enabling promising new applications in consumer electronic products.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Jiajia Ning, Yuan Xiong, Stephen Kershaw, Andrey L. Rogach
Summary: The most efficient way to improve the stability and optical properties of nanocrystals is to grow shell around their cores. Different growth modes of the ZnS shell on ZnSe nanorods were observed depending on the crystal structure of the ZnSe core, leading to differences in photoluminescence quantum yield.
CHEMISTRY OF MATERIALS
(2021)
Article
Biochemistry & Molecular Biology
Ilia Litvinov, Anna Salova, Nikolay Aksenov, Elena Kornilova, Tatiana Belyaeva
Summary: In this study, the photophysical characteristics of core/shell InP/ZnS quantum dots (InP-QDs) were analyzed in cell culture medium, salt solutions, and directly in the cells. It was found that InP-QDs were internalized into endolysosomes in HeLa and A549 cells with similar dynamics to Cd-based QDs, but the two cell lines accumulated them differently. InP-QDs were reliably detected in the endosomes despite their low quantum yields. Factors such as cell culture medium, acidic pH, and salt solutions were found to affect the photoluminescence lifetime of InP-QDs. The scatter between endosomes in the same cell was observed, indicating the complex impact of these factors on the state of InP-QDs. The toxicity of InP-QDs for both cell lines at concentrations higher than 20 nM was demonstrated.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Nanoscience & Nanotechnology
Jundiao Wang, Haoran Ning, Jun Wang, Stephen Kershaw, Lihong Jing, Pan Xiao
Summary: This study investigates the pressure-dependent photoluminescence (PL) responses of CuInS2 quantum dots (QDs) and CuInS2/ZnS core-shell QDs under repetitive pressure loadings. The CuInS2/ZnS QDs exhibit higher PL intensity and a repeatable relationship between PL emission peak energy (E-PL) and external pressure (P), which makes them desirable for stress/strain sensing applications.
ACS APPLIED NANO MATERIALS
(2022)
Article
Optics
Yanqing Zhu, Cong Shen, Xueqing Xu, Jianhua Zou, Lei Wang, Xudong Cheng, Jingqiu Liang, Xiudi Xiao, Gang Xu
Summary: This study investigates the effect of halogen acid treatment on the luminescence properties of InP/GaP/ZnS quantum dots (QDs). It is found that hydrofluoric acid (HF) and hydrochloric acid (HCl) can improve the optical properties of QDs, while hydrobromic acid (HBr) and hydroiodic acid (HI) are not conductive to enhance the photoluminescence quantum yield (PL QY) of QDs. HF and HCl can effectively etch the oxidative layer and passivate the surface indium dangling bonds in the form of atomic ligands. The proposed charge carrier recombination model suggests that the significantly improved PL QY after acid treatment is attributed to the recombination of electron-hole pairs mainly from the conduction band and valence band. InP QDs treated with HF exhibit the best luminescence properties, with a high PL QY of 96%, offering great potential for advanced optoelectronic devices.
JOURNAL OF LUMINESCENCE
(2023)
Article
Spectroscopy
Xiaoping Chen, Jianwei Lin, Yafeng Zhuang, Siqi Huang, Jinghua Chen, Zhizhong Han
Summary: A new ratiometric fluorescence sensor is developed for the selective detection of chlorotetracycline (CTC) using dual-mode fluorescence method, demonstrating good selectivity and sensitivity.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Chemistry, Multidisciplinary
Jiayao Li, Tianyong Guan, Datao Tu, Wei Lian, Peng Zhang, Siyuan Han, Fei Wen, Xueyuan Chen
Summary: Highly efficient luminescent AgInTe2:Zn/ZnS nanocrystals with a maximum NIR-II quantum yield of 25.2% have been designed by manipulating the structure to reduce internal and surface defects. These nanoprobes were used for sensitive homogeneous biodetection of xanthine oxidase with a limit of detection as low as 25 nU L-1.
CHEMICAL COMMUNICATIONS
(2022)
