MATERIALS LETTERS
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2021
·
IF 3.423
Dan Liu,Sen Wen,Yuxiao Guo,Xingtian Yin,Wenxiu Que
Subject to the complexity and high cost of traditional semiconductor materials and manufacturing processes, the features of facile solution process with low cost have made the colloidal quantum dots (CQDs) more competitive, in which HgTe nanocrystals can be tuned as a potential in infrared region and achieve a great photoresponsivity. Herein, we reported the synthesis and characterization of HgTe CQDs materials by a facile solution process, and explored the relationship between the nanocrystal size and the reaction temperature and time, as well as the effect of the ligand exchange on the thickness of the HgTe CQDs film. The as-fabricated photoconductive device showed a high photoresponse even under a weak light, which provides a direction for the next-generation infrared photodetectors.
研究领域:
材料科学
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纳米科技
·
光电子学
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半导体物理
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凝聚态物理
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Jianguang Jia,Chunmei Liu,Yuan Lin,Xiaowen Zhou
Charge recombination is an important factor that limits the cell efficiency of quantum dot sensitized solar cells (QDSSCs). Herein, we report a facile way to improve the cell performance of CdSe sensitized ZnO QDSSC by overcoating a thin layer of ZnSe on CdSe/ZnO film through a successive ionic layer adsorption and reaction (SILAR) procedure. Photovoltaic investigations indicate that ZnSe overcoating can increase photocurrent and photovoltage of the cell, resulting in significant enhancement of the cell efficiency, which is much better than the widely used traditional ZnS material. The superior role of ZnSe overcoating is ascribed to its large inhibition of charge recombination loss owing to its suitable band structure, efficient passivation of ZnO and CdSe QDs as well as its small lattice mismatch with CdSe that leads to the large decrease of surface/interface defects in CdSe/ZnO photoanode . This finding provides an alternative efficient way to enhance the cell performance of ZnO based QDSSC by suppressing the charge recombination.
研究领域:
材料科学
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纳米科技
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能源化学
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半导体物理
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光伏技术
✓ 已验证
DOI
高影响因子
RSC Advances
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2014
·Vol. 4
·期 48
·25183-25188
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IF 3.708
Meihua Wang,Weifen Niu,Xin Wu,Lixia Li,Jun Yang,Shaomin Shuang,Chuan Dong
3-Mercaptopropionic acid (MPA)-capped ZnS:Cu/ZnS core/shell quantum dots (QDs) have been synthesized via a facile aqueous coprecipitation method and characterized by fluorescence, UV-Vis absorption, infrared spectroscopy and transmission electron microscopy. The fluorescence of ZnS:Cu/ZnS could be increased in the presence of uric acid (UA). The affecting factors for the fluorescence of ZnS:Cu/ZnS were examined including pH, temperature and reacting time. Under the optimized conditions, the fluorescence intensity of the ZnS:Cu/ZnS QDs against the UA concentration showed a linear response in the range of 0.66 μM to 3.3 μM with the correlation coefficient (R2) 0.9973 and the limit of detection 0.044 μM. Most relevant molecules and physiological ions had no effect on the detection of UA. The feasibility of the developed method was further demonstrated by determining the concentration of uric acid in human urine samples and the recoveries were 95% ∼ 103%. Our work provides a sensitive, selective and convenient fluorescence method to determine UA in real samples.
研究领域:
分析化学
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纳米医学
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生物传感器
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临床检验
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分子诊断
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2019
·
IF 2.961
Hui Gao,Siyuan Liu,Zhipeng Xue,Wenjing Liu,Yanguang Nie,Guoqing Chen,Xiaolong Li
Herein, CsPbBr 3 quantum dots (QDs) were successfully synthesized via the supersaturated recrystallization (SR) method by using para-xylene as the anti-solvent. The as-prepared CsPbBr 3 QDs exhibited high quantum efficiency (78%) and narrow luminescent peaks with a full width at half maximum of around 21.2 nm. Compared with the commonly-used anti-solvents, para-xylene shows low toxic effect and high freezing point (13.3 °C). Therefore, CsPbBr 3 QDs can be easily preserved in the refrigerator like an ice-cream for further use. The maximum photoluminescence (PL) emission intensity would reach 90% retention after 60 days’ storage in the refrigerator. By using this simple method, the stability of CsPbBr 3 QDs has been effectively improved for long-term storage and further application.
研究领域:
材料科学
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纳米科技
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光电子学
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无机化学
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半导体材料
✓ 已验证
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2022
·
IF 6.76
Yuan Jin,Xiu Zhang,Tianci Feng,Meisheng Li,Huifang Xiao,Shouyong Zhou,Yijiang Zhao,Jing Zhong,Dawei Yang
Low ion conductivity and poor alkali resistance are still the two major obstacles for the applications of anion exchange membranes (AEMs). In this work, the combined strategies of Carbon quantum dots (CQDs) hybrid and cross-linking modification via side-chains designing were employed to prepare organic–inorganic hybrid AEMs. Then, the cross-linked quaternized polysulfone (CQPSf-CQDs) hybrid AEMs by incorporating carbon quantum dots were successfully fabricated. After hybrid and cross-linking, the mechanical properties of CQPSf-CQDs hybrid AEMs were higher than that of the pristine one, reaching 49.4 MPa for the best one. Meanwhile, the existence of CQDs can expand the hydrophilic area in the membrane, which is beneficial to the transport of O H - . The incorporated CQDs interact weakly with cationic groups in the side chains through hydrogen bonds. The simulation results further demonstrated that the introduction of CQDs was beneficial to the construction of hydrophilic and hydrophobic domains, thereby increasing O H - conductivity. In addition, the prepared hybrid membranes own excellent dimensional stabilities and ion transport performances. These preliminary results give us a lot of hopes for further experiments and optimizations for the hybrid AEMs.
研究领域:
材料科学
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高分子化学
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膜科学与技术
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电化学
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能源材料
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS CHEMISTRY
·
2011
·Vol. 21
·期 18
·6569-6575
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IF 5.101
Xintao Luo,Jishu Han,Yang Ning,Zhe Lin,Hao Zhang,Bai Yang
1-Thioglycerol (TG)-stabilized quantum dots (QDs) are good candidate for performing a stepwise polymerization reaction with polyurethane (PU) prepolymers, but their use is limited by their worse photoluminescence (PL) in comparison to QDs stabilized by other mercapto-ligands. To overcome this problem, TG-stabilized CdTe QDs with enhanced PL were synthesized in water through a N2H4-promoted growth approach. The current synthesis significantly shortened the duration of the size evolution of QDs, particularly for obtaining samples with orange and red emissions. It also permitted QD growth at low temperatures, such as room temperature, which avoided the decomposition of TG and subsequent embedment of sulfur into the QDs as occurs in the conventional synthesis. Most importantly, the TG ligand endowed the QDs with hydroxyl coverage, making the QDs miscible with PU prepolymers in dimethyl sulfoxide, and therefore overcoming the main problem in fabricating PU-based nanocomposites of eliminating water. The hydroxyl coverage further allowed for the linkage of PU on the surface of the QDs through the reaction between –OH and –NCO, producing CdTe QD–PU bulk nanocomposites. Systematic characterization indicated that the QDs were well dispersed in the PU medium, and the size-dependent PL of QDs was also maintained.
研究领域:
材料科学
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纳米科技
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高分子化学
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光电子学
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胶体与界面化学
✓ 已验证
DOI
高影响因子
CARBON
·
2012
·Vol. 50
·期 8
·2810-2815
·
IF 5.378
Yongqiang Dong,Ruixue Wang,Hao Li,Jingwei Shao,Yuwu Chi,Xiaomei Lin,Guonan Chen
Polyamine-functionalized carbon quantum dots (CQDs) with high fluorescence quantum yield (42.5%) have been synthesized by the low temperature (<200 °C) carbonization of citric acid with branched polyethylenimine (BPEI) in one simple step. The obtained BPEI–CQDs are spherical graphite nanocrystals (average 6.2 nm in size) capped with abundant BPEI at their surfaces. It is the first report that CQDs are both amino-functionalized and highly fluorescent, which suggests their promising applications in chemical sensing.
研究领域:
分析化学
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纳米材料
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生物传感
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荧光成像
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分子探针
✓ 已验证
DOI
高影响因子
ORGANIC ELECTRONICS
·
2019
·
IF 3.495
Yan Zhang,Zhenlong Zhang,Yanyan Liu,Yuefeng Liu,Huiping Gao,Yanli Mao
In this work, we synthesized CuInSe 2 quantum dots (CISe QDs) and applied them to perovskite solar cells (PSCs) as an inorganic hole-transporting material (HTM). A power conversion efficiency (PCE) of 12.8% was achieved for the PSCs using CISe QDs as the HTM, which is the highest value reported to date for devices with a Cu-based chalcopyrite semiconductor as HTM. More importantly, the stability of PSCs with CISe QDs was significantly improved compared with that of the devices using spiro-OMeTAD as the HTM. These results demonstrate that CISe QDs are a promising inorganic HTM for PSCs with long-term stability and low cost.
研究领域:
材料科学
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光伏技术
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纳米材料
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能源化学
·
半导体物理
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·Vol. 44
·期 3
·1586-1596
·
IF 4.229
Tianyu Zhao,Zipeng Xing,Ziyuan Xiu,Zhenzi Li,Shilin Yang,Qi Zhu,Wei Zhou
TiO 2-x /g-C 3 N 4 /CdS ternary heterojunctions are fabricated through thermal polymerization-chemical bath deposition combined with in-situ solid-state chemical reduction approach. The prepared materials are characterized by X-ray diffraction, Fourier transform infrared spectra , scanning electron microscopy, transmission electron microscopy , nitrogen adsorption-desorption, and X-ray photoelectron spectroscopy. The results show that the ternary heterojunctions are formed successfully and CdS quantum dots (QDs) and TiO 2 are anchored on surface of g-C 3 N 4 nanosheets simultaneously. The visible-light-driven photocatalytic degradation ratio of Bisphenol A and hydrogen production rate are up to 95% and ∼254.8 μmol h −1 , respectively, which are several times higher than that of pristine TiO 2 . The excellent visible-light-driven photocatalytic activity can be ascribed to the synergistic effect of TiO 2−x , g-C 3 N 4 and CdS QDs which extend the photoresponse to visible light region and favor the spatial separation of photogenerated charge carriers.
研究领域:
材料科学
·
光催化
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纳米材料
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环境催化
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能源化学
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
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2019
·
IF 2.687
Jiang Wu,Haowen Bai,Wenjie Qu,Guanying Cao,Yanjie Zhang,Jingjie Yu
CsPbBr 3 quantum-dot borosilicate microcrystals and Eu 3+ -doped CsPbBr 3 quantum-dot microcrystals with different concentrations of Eu 3+ are successfully prepared by high temperature melting. The particle morphology of the microcrystals is characterized by scanning electron microscopy (SEM). The fluorescence characteristics are analyzed by fluorescence spectroscopy and CIE chromaticity coordinates . In this research, CsPbBr 3 quantum dots are effectively coated with borosilicate microcrystals to improve the stability of CsPbBr 3 quantum dots while ensuring its strong green emission at 517 nm. The energy transfer from CsPbBr 3 quantum dots to Eu 3+ occurs after doping. When changing the concentration of Eu 3+ , the emission peaks of perovskite broaden and blue shift occurs (517 nm→474 nm). The CIE color coordinate moves from (0.0807, 0.7200) to (0.4537, 0.2724). Therefore, the continuous adjustment of solid perovskite materials from green light to blue light and then to red light region is realized.
研究领域:
材料科学
·
纳米光学
·
无机非金属材料
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光电子学
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发光材料
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固态化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Yongsheng Yang,Siyuan Tang,Da Chen,Changxing Wang,Bingli Gu,Xiameng Li,Feng Xie,Gang Wang,Qinglei Guo
In this study, red-emission graphene quantum dots (R-GQDs), with tunable emission wavelength , are synthesized and explored for applications in trace water sensing, white light emitting diodes (WLEDs) and information encryption . Systematic experiments and characterizations demonstrate that the as-fabricated R-GQDs possess homogeneous size, good crystallinity and high doping concentration of nitrogen and oxygen. Moreover, tunable multicolor light emissions of R-GQDs are demonstrated by simply adjusting the polarity of surrounding solvents. As a result, solid-state fluorescence films are successfully fabricated to construct a high-quality WLED, with the CIE (Commission International d′Eclairage) coordinates (0.352, 0.380) and color temperature of 5121 K. Besides, the water quenchable fluorescence of R-GQDs enables the fabrication of a trace water sensing platform, with the low detection limit of 0.034%. Finally, the potential of our prepared R-GQDs for the application in color visual information encryption is developed. This study may pave the way for the development of GQDs, especially in optically sensing, optoelectronics and anti-counterfeiting technology.
研究领域:
纳米材料学
·
光学传感
·
光电子学
·
分析化学
·
防伪技术
✓ 已验证
DOI
高影响因子
Small
·
2020
·Vol. 16
·期 38
·2003557
·
IF 11.459
Zheng Liu,Su Zhang,Zhipeng Qiu,Chao Huangfu,Lin Wang,Tong Wei,Zhuangjun Fan
Tin (Sn) is considered to be an ideal candidate for the anode of sodium ion batteries. However, the design of Sn-based electrodes with maintained long-term stability still remains challenging due to their huge volume expansion (≈420%) and easy pulverization during cycling. Herein, a facile and versatile strategy for the synthesis of nitrogen-doped graphene quantum dot (GQD) edge-anchored Sn nanodots as the pillars into reduced graphene oxide blocks (NGQD/Sn-NG) for ultrafast and ultrastable sodium-ion storage is reported. Sn nanodots (2–5 nm) anchored at the edges of “octopus-like” GQDs via covalent Sn O C/Sn N C bonds function as the pillars that ensure fast Na-ion/electron transport across the graphene blocks. Moreover, the chemical and spatial (layered structure) confinements not only suppress Sn aggregation, but also function as physical barriers for buffering volume change upon sodiation/desodiation. Consequently, the NGQD/Sn-NG with high structural stability exhibits excellent rate performance (555 mAh g −1 at 0.1 A g −1 and 198 mAh g −1 at 10 A g −1 ) and ultra-long cycling stability (184 mAh g −1 remaining even after 2000 cycles at 5 A g −1 ). The confinement-induced synthesis together with remarkable electrochemical performances should shed light on the practical application of highly attractive tin-based anodes for next generation rechargeable sodium batteries.
研究领域:
材料科学
·
电化学
·
纳米能源
·
储能材料
·
先进电池技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）