JOURNAL OF FLUORESCENCE
·
2024
·
IF 2.6
Jia Zixuan,Chen Menghan,Yang Mohan,Chen Shenna,Zhang Xuhong
In this study, a novel fluorescent probe based on CuInS 2 quantum dots modified with alanine (Ala-CuInS 2 QDs) was developed for the detection of lead ions and cysteine (Pb 2+ and Cys). Ala-CuInS 2 QDs were synthesized through a one-step hydrothermal method exhibiting uniform size, good stability and water solubility. The QDs were then utilized as an “on-off-on” fluorescence sensor to detect Pb 2+ and Cys in the ranges of 0–20 µM and 0–55 µM respectively, with detection limits of 0.29 µM and 0.66 µM. The mechanism of fluorescence quenching and recovery processes was also explored. Furthermore, Ala-CuInS 2 QDs have been successfully applied to detect Pb 2+ in tap and river water and detect cysteine in serum.
研究领域:
分析化学
·
环境科学
·
生物医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2014
·Vol. 16
·期 32
·7469-7477
·
IF 3.858
Chenghui Xia,Lixin Cao,Wei Liu,Ge Su,Rongjie Gao,Hua Qu,Liang Shi,Guanghui He
This paper aims to systematically optimize the preparation process of CuInS2 (CIS) QDs by intensively manipulating kinetic variables including reaction temperature, reaction time, In/Cu ratio and surface ligand. CIS QDs were synthesized using copper iodide and indium acetate in the presence of 1-octadecene (ODE) that was used as reaction solvent, while 1-dodecanethiol (DDT) was chosen as the sulfur source and surface ligand. UV-Vis spectroscopy and fluorescence spectroscopy were applied to reveal the growth kinetics and fluorescence properties of CIS QDs. Transmission electron microscopy and X-ray diffraction were utilized to characterize the size, morphology and crystal structure of the final products. Our results reveal that the emission wavelength of CIS QDs could be found at visible light and near-infrared regions ranging from 630 to 825 nm. By scrupulous regulation of the reaction temperature, reaction time and the amount of DDT, highly dispersed and stable hydrophobic CIS QDs could be prepared directly without any further modification by one-step method. The fluorescence intensity could be enhanced by introducing Cu defects with the fluorescence quantum yield (QY%) reaching around 7%, while the particle size could be tuned from ultra-small sizes approaching 1.5 nm to 4 nm, by controlling the In/Cu ratio.
研究领域:
材料科学
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纳米技术
·
光学
✓ 已验证
DOI
高影响因子
Results in Chemistry
·
2020
·
IF 0
Jiajia Fang,Beina Dong,Yingqiang Fu,Dingxing Tang
Thioglycolic acid-modified CuInS 2 quantum dots were prepared by a hydrothermal method. A method for the determination of sparfloxacin by a CuInS 2 ternary-quantum dot fluorescence probe was established based on the fact that the fluorescence of CuInS 2 quantum dots can be significantly quenched by sparfloxacin. The optimized experimental conditions are as follows: (1) the concentration of CuInS 2 quantum dots is 0.4 mol·L − 1 ; (2) the pH of the buffer solution is 6, and 1 mL of buffer was used; (3) the reaction time is 5 min. The concentration of sparfloxacin is linearly related to the fluorescence quenching intensity from 0.5 μg/mL to 1 mg/mL, and the maximum detection limit is 1 mg/mL.
研究领域:
分析化学
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纳米技术
·
药物分析
✓ 已验证
产品关联
DOI
ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Chuanzhen Zhao,Zelong Bai,Xiangyou Liu,Yijia Zhang,Bingsuo Zou,Haizheng Zhong
An efficient ligand exchange strategy for aqueous phase transfer of hydrophobic CuInS2/ZnS quantum dots was developed by employing glutathione (GSH) and mercaptopropionic acid (MPA) as the ligands. The whole process takes less than 20 min and can be scaled up to gram amount. The material characterizations show that the final aqueous soluble samples are solely capped with GSH on the surface. Importantly, these GSH-capped CuInS2/ZnS quantum dots have small size (hydrodynamic diameter <10 nm), moderate fluorescent properties (up to 34%) as well as high stability in aqueous solutions (stable for more than three months in 4 °C without any significant fluorescence quenching). Moreover, this ligand exchange strategy is also versatile for the aqueous phase transfer of other hydrophobic quantum dots, for instance, CuInSe2 and CdSe/ZnS quantum dots. We further demonstrated that GSH-capped quantum dots could be suitable fluorescence markers to penetrate cell membrane and image the cells. In addition, the GSH-capped CuInS2 quantum dots also have potential use in other fields such as photocatalysis and quantum dots sensitized solar cells.
研究领域:
材料科学
·
生物学
·
医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2021
·Vol. 13
·期 12
·1517-1526
·
IF 2.896
Ziang Guo,Xiaowei Huang,Zhihua Li,Jiyong Shi,Xiaodong Zhai,Xuetao Hu,Xiaobo Zou
This paper describes a near-infrared quantum dot (CuInS2 QD)/antibiotic (vancomycin) nanoparticle-based assay for the Staphylococcus aureus and iron(III) detection. CuInS2 QDs with good biological tissue permeability and biocompatibility are combined with vancomycin through covalent interaction to form a detection system for two harmful factors. The detection principle of Staphylococcus aureus is mainly the fluorescence quenching caused by the accumulation of CuInS2@Van QDs on the surface of Staphylococcus aureus. The detection principles of the iron(III) ion are mainly ascribed to the aggregation of quantum dots and the transfer of charges, which cause the fluorescence signal to change. The linear range of S. aureus and the Fe3+ ion is 103 to 108 CFU mL−1 and 10–90 μM, respectively. Their detection limits are 665 CFU mL−1 and 3.5 μM, respectively. The procedure was validated by the quantitation of Staphylococcus aureus and iron(III) in spiked samples, and was found to demonstrate the feasibility of this method.
研究领域:
生物医学
·
分析化学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Ying-Chu Chen,Hao-Hsuan Chang,Yu-Kuei Hsu
Decoration of CuInS2 (CIS) quantum dots (QDs) on ZnO nanowires (NWs) with an interlayer of In2S3 as photoelectrode has been successfully fabricated on FTO via the simple solution routes for photoelectrochemical (PEC) application. Scanning electron microscopy, transmission electron microscopy, and X-ray diffraction are utilized to systematically analyze the morphology and structure of the CIS QD/In2S3/ZnO NWs heterostructure. The composition of this multilayer heterostructure and the removal of QD ligands by a thermal process are confirmed by X-ray photoelectron spectra. In comparison with CIS QDs/ZnO NWs, the CIS QD/In2S3/ZnO heterostructural photoelectrode displays an efficient charge separation and carrier transport path for photocurrent up to 2.4 mA·cm–2 that is competitive with other Cd- and Pb-free QD-based materials. In addition, Mott–Schottky analysis demonstrates the negative shift of the flat band in the CIS QD/In2S3/ZnO, which benefits the early onset potential. Significantly, this hierarchical photoelectrode shows the improvement the absorption and conversion of solar light in the visible region obtained using a pristine ZnO structure. Our research paves the way for exploring lead-free and lead-free sulfide materials in the new category of solar applications.
研究领域:
材料科学
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太阳能技术
·
纳米科技
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2018
·Vol. 47
·期 16
·5652-5659
·
IF 4.099
Yong-Jun Yuan,Gaoliang Fang,Daqin Chen,Yanwei Huang,Ling-Xia Yang,Da-Peng Cao,Jingjing Wang,Zhen-Tao Yu,Zhi-Gang Zou
Expanding the photoresponse range of TiO2-based photocatalysts is of great interest for photocatalytic H2 production. Herein, noble-metal-free CuInS2 quantum dots were employed as a novel inorganic dye to expand the visible light absorption of TiO2/MoS2 for solar H2 generation. The as-prepared CuInS2/TiO2/MoS2 photocatalysts exhibit broad absorption from the ultraviolet to near-infrared region. Under visible light irradiation (λ > 420 nm), the CuInS2/TiO2/MoS2 photocatalyst with 0.6 mmol g−1 CuInS2 and 0.5 wt% MoS2 showed the highest H2 evolution rate with a value of 1034 μmol h−1 g−1. Moreover, a considerable H2 evolution rate of 141 μmol h−1 g−1 was obtained under the irradiation of the optimized CuInS2/TiO2/MoS2 photocatalyst with >500 nm light. The reaction mechanism of the CuInS2/TiO2/MoS2 photocatalyst for photocatalytic H2 evolution was investigated in detail by photoluminescence decay study, and the results showed that the photoexcited electrons of CuInS2 can be transferred efficiently through TiO2 to MoS2 and then react with the absorbed protons to generate H2. The reported sensitization strategy tremendously improves the visible light absorption capacity and the photocatalytic performance of TiO2-based photocatalysts.
研究领域:
材料科学
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光催化
·
能源化学
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纳米材料
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半导体物理
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太阳能转化
✓ 已验证
DOI
高影响因子
Nano Energy
·
2017
·
IF 12.343
Guoshuai Wang,Huiyun Wei,Jiangjian Shi,Yuzhuan Xu,Huijue Wu,Yanhong Luo,Dongmei Li,Qingbo Meng
Aiming at improving the cell performance of colloidal CuInS 2 (CIS) quantum dot sensitized solar cells (QDSCs), a modified synthetic method has been developed to prepare CIS quantum dots (QDs), and Cu/In non-stoichiometric ratios of CIS QDs have been carefully controlled for the first time. It is found that, with the amount of In element increasing, the short-circuit photocurrent density ( J sc ), open-circuit voltage ( V oc ) and fill factor ( FF ) of CIS QDSCs will gradually increase, leading to the cell performance enhanced. Up to 8.54% PCE has been achieved when the Cu/In precursor molar ratio is 1/4, which is a new record for the CIS-based solar cells. Electrochemical impedance analysis, open-circuit voltage-decay (OCVD) and time-resolved photoluminescence analyses further confirm that In-rich CIS QDs can bring about surface defect states significantly reduced, thus leading to the charge recombination at TiO 2 /CIS/electrolyte interfaces efficiently inhibited. Interfacial electron recombination mechanism of the solar cells is proposed that photo-generated carrier recombination in the cell is mainly dominated by the electron transfer process from the conduction band of TiO 2 to unoccupied defect states of CIS, which has a great influence on the FF of the device. This work provides a new and simple way to reduce the loss of photo-generated carriers, improve the interfacial carrier collection and achieve highly efficient QDSCs.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
ACTA PHYSICO-CHIMICA SINICA
·
2015
·Vol. 31
·期 7
·1331-1337
·
IF 0.852
WANG Nan,LIANG Zhu-Rong,WANG Xin,XU Xue-Qing,FANG Jun,WANG Jun-Xia,GUO Hua-Fang
Colloidal chalcopyrite CuInS2 (CIS) quantum dots (QDs) were synthesized using copper(I) iodine (CuI) and indium(III) acetate (InAc3) as metal cationic precursors, and dodecanethiol (DDT) as the sulfur source and solvent. The microstructure and optical properties of the prepared
CIS QDs were characterized by X-ray diffraction (XRD), Raman spectroscopy, high-resolution transmission electron microscopy (HRTEM), and UVVis absorption spectroscopy. The results showed that the CIS consisted of chalcopyrite phase and exhibited Cu-Au ordering. With prolonged reaction time,
the grain sizes of the QDs became larger and the absorption edges of the CIS QDs showed a red-shift owing to the size-induced quantum confinement effect. For the first time, DDT-capped CIS QDs with narrow size distribution were connected to the inner surface of mesoporous TiO2 films
via a thioglycolic acid (TGA)-assisted adsorption approach, which was simple and easy to carry out. The adsorption behaviors of both TGA and the CIS QDs on the TiO2 films were detected by attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy. The results
indicated that TGA was adsorbed onto the surface of TiO2
via COOH groups while the ―SH group was exposed outside, and replaced DDT at the surface of the CIS QDs, leading to the attachment between TiO2 and CIS. It was revealed that the CIS QDs of ~3.6 nm
in size exhibited the best light absorption capacity and photovoltaic performance. An over-coating of CdS significantly improved the performance of the QDS
研究领域:
材料科学
·
纳米技术
·
太阳能电池研究
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Jundiao Wang,Haoran Ning,Jun Wang,Stephen V. Kershaw,Lihong Jing,Pan Xiao
Semiconductor quantum dots (QDs) are promising materials for stress/strain sensing applications owing to their pressure-dependent photoluminescence (PL) and nanoscale size, while the impact of stress and microstructure on their optical properties still awaits in-depth investigations under more realistic loading conditions. Herein, bare CuInS2 QDs and core–shell structured CuInS2/ZnS QDs are investigated under repetitive pressure loadings to elucidate the pressure-dependent PL responses over many pressure cycles. The CuInS2/ZnS QDs not only show higher PL intensity but also exhibit a reliable and simple relationship between PL emission peak energy (EPL) and external pressure (P), which is desirable for actual application in stress/strain sensing. Specifically, the EPL–P relationship of bare CuInS2 QDs changes after the first loading–unloading cycle, while the EPL–P relationship of CuInS2/ZnS QDs shows repeatable trajectories under different cycles. This research provides experimental support for designing QD-based stress/strain sensing materials and explains how the shell and surface microstructure will affect the mechanical-luminescence responses of QDs.
研究领域:
材料科学
·
纳米技术
·
光电
·
传感器
✓ 已验证
产品关联
DOI
高影响因子
SOLID STATE IONICS
·
2024
·
IF 3
Yushan Li,Jiao Men,Guangyan Zhou,Yanhong Qiao,Jingbo Zhang
To reveal the ways and causes of conversion efficiency enhancement for quantum dot-sensitized solar cells (QDSSCs), chalcopyrite structure CuInS 2 quantum dots (QDs) was synthesized in oil phase by the high temperature hot injection method. Then, QDs were transferred from oil phase to water phase with 3-mercaptopropionic acid as a ligand exchange reagent and loaded inducer of QDs. 3-mercaptopropionic acid coated QDs in water phase were sensitized on TiO 2 nanocrystalline thin films to fabricate QDSSCs. The sensitization time of QDs and pH value in QDs solution are two important factors to affect the loading amounts of QDs and performance of the final assembled QDSSCs. Long-time sensitization of QDs on the TiO 2 porous thin film will cause QDs to agglomerate and stack on the film. The pH of QDs aqueous solution influences the stable existence in solution of QDs and adsorption on the surface of TiO 2 . By balancing the influence of the above two factors, the optimal sensitization condition of CuInS 2 QDs is adsorption in pH = 11 QDs solution for 2 h. In addition, the interface between QD-sensitized TiO 2 porous thin film and FTO is another factor to affect the photoelectric conversion efficiency of QDSSCs. By adding Zn-doped TiO 2 compact layer with high conductivity and electron mobility on QDSSCs to modify this interface, the photoelectric conversion efficiency of QDSSCs was further increased by 66.4 %.
研究领域:
材料科学
·
纳米技术
·
太阳能
·
化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）