ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Qian Dang,Fan Liao,Yuyang Sun,Shanshan Zhang,Hui Huang,Wen Shen,Zhenhui Kang,Yandi Shi,Mingwang Shao
Though noble metals play a key role in the clean energy research, their wide practical applications have been limited by the high cost and the scarce natural reserves. It is significant to decrease their usage and increase the active sites in the catalysis. Herein, Rh nanocrystals were grown on the surface of silicon quantum dots with the help of Si H bonds to obtain Rh Si composites, which combined with carbon quantum dots to fabricate Rh Si C nanocomposites . The silicon quantum dots limited the size of Rh and prevented the aggregation. The addition of carbon quantum dots greatly increased the electron transportation during the catalytic process. When the Rh Si C nanocomposites were applied as electrocatalysts for hydrogen evolution reaction (HER), the optimal one exhibits Pt-like HER performance (low Tafel slope of 26 mV·dec -1 and long-term stability) with the content of noble metal less than half of that in 20 wt% Pt/C. This work could put forward an effective avenue to develop high efficient and affordable electrochemical catalysts for HER.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2013
·
IF 2.144
Suyan Ying,Shumin Cui,Weiping Wang,Jiuju Feng,Jianrong Chen
A simple and sensitive method for detecting diprophylline (DPP) was developed based on the fluorescence quenching of glutathione-capped CdTe quantum dots (GSH–CdTe QDs) by using diprophylline in a KH 2 PO 4 –Na 2 HPO 4 medium. Parameters affecting the quenching efficiency, including types and pH of buffer solutions as well as temperature, reaction time, adding sequence, and interfering substances, were investigated and optimized. In optimum conditions, the calibration plot of the quenched fluorescence intensity F 0 / F with a DPP concentration range of 1.67×10 –6 mol L −1 to 1.33×10 –5 mol L −1 was linear. The detection limit (with signal to noise ratio of 3) for DPP was 2.24×10 –7 mol L −1 . The proposed method was successfully applied for detecting DPP in human serum. The recovery of the method was in the range of 87.41% to 117.94%. Finally, the possible quenching mechanism of GSH–CdTe QDs and DPP was also discussed.
研究领域:
分析化学
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药学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2022
·Vol. 414
·期 7
·2471-2480
·
IF 4.478
Zhang Hanqiang,Li Yufei,Lu Haixin,Gan Feng
A new dual-mode ratiometric fluorescence and colorimetric probe for selective determination of Cu 2+ was developed based on blue-emission sulfur quantum dots (SQDs) and yellow-emission carbon quantum dots (CQDs). The fluorescence and absorbance of CQDs increased in the presence of Cu 2+ due to the Cu 2+ -oxidized o-phenylenediamine group on the surface of the CQDs. Because of the inner filter effect between SQDs and CQDs-Cu 2+ , the fluorescence response of SQDs decreased following the introduction of Cu 2+ . Furthermore, in the presence of Cu 2+ , the dual-mode SQD–CQD probe showed visible color changes under both ultraviolet light and sunlight. Under optimal conditions, the dual-mode probe was used to quantitatively detect Cu 2+ with a linear range of 0.1–5.0 μM for ratiometric fluorescence and colorimetry, with a limit of detection of about 31 nM and 47 nM, respectively. Finally, the dual-mode probe was used for the determination of Cu 2+ in practical samples to expand the practical application, and the difference between ratiometric fluorescence and colorimetric methods was compared. The recovery results confirmed the high accuracy of the dual-mode probe, showing that it has immense potential for sensitive and selective detection of Cu 2+ in practical samples. Graphical abstract
研究领域:
分析化学
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环境科学
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材料科学
✓ 已验证
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 81
·77963-77967
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IF 3.289
Jinhua Du,Shuhong Xu,Chunlei Wang,Jiangyong Pan,Jing Chen,Li Zhu,Changgui Lv,Yiping Cui
The first aqueous red CdTe QD-LED was fabricated with the structure of ITO/PEDOT:PSS/PVK/CdTe QDs/ZnO/Al. The device has been considered to be an advanced aqueous QD-LED, which demonstrated a turn-on voltage of about 5 V. Further, its current density and brightness would also reach 92 mA cm−2 and 58 cd m−2 at the voltage of 10 V. Moreover, we found that there were two essential factors for fabricating an aqueous QD-LED successfully: (1) adding wet agent to the QD solution, (2) removing the composite ions remaining in the QD solution. Meanwhile, the EL intensity of the aqueous QD-LEDs will perform better if the solution of QDs is acidic. These results offer a promising approach to the further development of aqueous QD-LEDs.
研究领域:
材料科学
·
光电技术
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2016
·
IF 4.712
Yao Fan,Li Liu,Donglei Sun,Hanyue Lan,Haiyan Fu,Tianming Yang,Yuanbin She,Chuang Ni
As a popular detection model, the fluorescence “turn-off” sensor based on quantum dots (QDs) has already been successfully employed in the detections of many materials, especially in the researches on the interactions between pesticides. However, the previous studies are mainly focused on simple single track or the comparison based on similar concentration of drugs. In this work, a new detection method based on the fluorescence “turn-off” model with water-soluble ZnCdSe and CdSe QDs simultaneously as the fluorescent probes is established to detect various pesticides. The fluorescence of the two QDs can be quenched by different pesticides with varying degrees, which leads to the differences in positions and intensities of two peaks. By combining with chemometrics methods, all the pesticides can be qualitative and quantitative respectively even in real samples with the limit of detection was 2 × 10 −8 mol L −1 and a recognition rate of 100%. This work is, to the best of our knowledge, the first report on the detection of pesticides based on the fluorescence quenching phenomenon of double quantum dots combined with chemometrics methods. What's more, the excellent selectivity of the system has been verified in different mediums such as mixed ion disruption, waste water , tea and water extraction liquid drugs.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Ruiming Jia,Honggang Lu,Chenjie Wang,Wei Guan,Hongzhou Dong,Beili Pang,Lina Sui,Zhixing Gan,Lifeng Dong,Liyan Yu
The emergence of two dimensional (2D) nanosheets provides flexible platforms for the construction of semiconductor heterostructures for photocatalytic hydrogen evolution. However, the compact and conformal contact between the components with different dimensions remains challenge. Herein, we anchor the 2D layered black phosphorous quantum dots (BPQDs) onto the 2D ZnIn 2 S 4 nanosheets with sulfur vacancies (V-ZIS). This unique interface between 2D layered QDs and 2D nanosheets ensures a sufficient contact area between the BPQDs and the V-ZIS, which is conducive to the transport and the spatial separation of photogenerated electrons and holes. A synergistic effect of sulfur vacancies and type-Ⅱ heterojunction results in an excellent photocatalytic hydrogen evolution performance of the BPQDs/V-ZIS composites. The hydrogen evolution rate by the BPQDs/V-ZIS without any noble-metal as cocatalyst is up to 5079 μmol g −1 h −1 under visible light irradiation with an apparent quantum yield (AQY) of 12.03% at 420 nm, which is dramatically higher than most other photocatalysts reported previously.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
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2018
·
IF 3.525
Guoqiang Shen,Lun Pan,Zhe Lü,Chongqing Wang,Fazal-e- Aleem,Xiangwen Zhang,Ji-Jun Zou
Adsorption and photodegradation are promising approaches for removing organic pollutions. In this study, we combined these two processes by co-loading Fe-TiO 2 and Fe 2 O 3 quantum dots (QDs) on porous MCM-41, using a simple hydrolysis method. X-ray diffraction, high-resolution transmission electron microscopy, and X-ray photoelectron spectroscopy results indicated that Fe-TiO 2 QDs are formed at low Fe precursor concentrations, while additional Fe 2 O 3 QDs are formed at higher Fe precursor concentrations. The Fe 2 O 3 and Fe-TiO 2 QDs impart high adsorption capacity and high photoactivity to the porous MCM-41, respectively. Thus, their combination results in a synergic effect of the adsorption and photodegradation. The highest-performing sample exhibits excellent performance in removing rose bengal from aqueous solution.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 10
·2573-2579
·
IF 5.976
Ruiqi Guo,Ting Shen,Jianjun Tian
“Green” narrow band-gap CuInSe2 quantum dots (QDs) were first introduced in photodetectors. Thus, a broadband hybrid photodetector was obtained by combining the ultraviolet detection of spiro-OMeTAD and the near-infrared detection of CuInSe2 QDs. In order to improve the detection of the device, the oil-soluble CuInSe2 QDs were transformed into water-soluble MPA-capped QDs through ligand exchange, which drastically shortened the length of the surface ligand. The specific detectivity (D*) of the photodetector reached 1.6 × 1012 Jones at 330 nm and 7.5 × 1010 Jones at a 1000 nm wavelength. The unencapsulated device also displayed a fast response time (<0.02 s) and excellent thermal stability (20–100 °C) in ambient air. This work could open a window of toxic-free QD based photodetectors to achieve a broadband response.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Fei Li,Zhiguo Xia,Quanlin Liu
The ability to control dopants and defects, as well as the core/shell structures, of quantum dots (QDs) is an essential nanotechnology to modify and optimize their photoluminescence properties. Herein, the optimized ZnS:Mn2+/ZnS/ZnS:Cu2+/ZnS core/multishell QDs have been prepared, and their luminescence properties depending on the ratios of the starting materials and the injection temperature of an extra sulfur source were discussed; finally the white light can be possibly obtained by mixing the blue light (emission peak at 450 nm originating from Cu2+ dopants or emission peaks at 405 and 430 nm corresponding to a defect emission center) and orange light (emission peak at 585 nm from Mn2+ dopants). As a controlled synthesis comparison, the optimum core/shell structures and key synthesis parameters have been determined, and the quantum yield (QY) of the as-obtained ZnS:Mn2+/ZnS/ZnS:Cu2+/ZnS core/multishell white light emitting QDs without defect emission was determined to be 38%. The practical white light device prototype has been also fabricated and the CIE color coordinate of (0.32, 0.34) with a warm white light has been realized upon the excitation of the commercial 370 nm UV LED chip, which demonstrated potential application for micro/nano optical functional devices.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Haobing Zhao,Hailong Hu,Jinping Zheng,Yuan Qie,Kuibao Yu,Yangbin Zhu,Zhiqi Luo,Lihua Lin,Kaiyu Yang,Tailiang Guo,Fushan Li
With tunable emission in the full visible region, the ecofriendly InP quantum dots (QDs) show unique application prospects in light-emitting devices. At present, InP QDs suffer from wide-bandwidth emission, especially for electroluminescence (EL), which hinders their applications in high-performance display devices. Here, we report a facile one-pot synthesis of narrow-bandwidth InP/ZnSeS/ZnS QDs using a safe phosphorus source of tris(dimethylamino)phosphine, in which the ZnSeS inner-shell layer is formed via temperature-gradient solution growth from 240 to 280 °C. The synthesized green QDs have a high photoluminescence quantum yield (PLQY) of 91% and full width at half-maximum (fwhm) of 36 nm. Moreover, the resultant quantum dot light-emitting devices (QLEDs) also show a narrow fwhm of 42 nm, which is the narrowest emission of green InP QLEDs based on a safe phosphorus source reported so far. Further modulation of the electron injection into the device by inserting a thin layer of lithium fluoride results in a peak external quantum efficiency of 5.56%.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2018
·Vol. 10
·期 15
·7155-7162
·
IF 7.233
Kai-Kai Liu,Xiao-Ming Li,Shao-Bo Cheng,Rui Zhou,Ya-Chuan Liang,Lin Dong,Chong-Xin Shan,Hai-Bo Zeng,De-Zhen Shen
Aggregation-induced quenching (ACQ) in carbon nanodots (CNDs) impede their applications in solid devices. Herein, the concept of alternating quantum dot (QD) chains was proposed to overcome the common issue of fluorescence quenching in CNDs; in this study, CNDs and ZnO QDs were interlinked to form carbon-ZnO alternating quantum dot chains (CZA-QDCs), which overcame the ACQ of CNDs and hence ensured efficient full-spectrum fluorescence for white light-emitting devices (WLEDs) without excessive blue emission. Under the excitation of 365 nm lines, white emission resulting from the combination of blue emission from the CNDs and yellow emission from the ZnO QDs has been achieved from these powders. The quantum efficiency of the CZA-QDC powders can reach 49% and remain stable for two months. By coating the powders onto an ultraviolet chip as phosphors, WLEDs with a luminous efficiency of 20.1 lm W−1, color coordinate of (0.30, 0.35), correlated color temperature of 5205 K, and a color rendering index of 84 have been fabricated. Due to the relatively high abundance and eco-friendly characteristics of both carbon and ZnO, the results reported herein may provide a promising alternative to fluorescent phosphors that are widely used in WLEDs.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 24
·7279-7287
·
IF 6.641
Tong Yan,Yunyan Li,Xiaoxiao Song,Jie Wang,Zhuoying Xie,Dawei Deng
The cytotoxicities of the elements of current quantum dots (QDs) greatly restrict their applications in biomedical fields. Herein, we firstly proposed and synthesized oil-soluble heavier-element-free (or Cd-free) CuFeS2/ZnS QDs, and focused on the synthetic controls over the core/shell structure. It was found that although the as-prepared CuFeS2 QDs are nonemissive, the in situ ZnS-overcoating could make them exhibit bright near-infrared (NIR) photoluminescence (PL) (PL peak at 840 nm; PL quantum yield (QY) up to 52%). We also analyzed their shape, structure and elemental composition in detail. Next, by the interaction between oil-soluble QDs and liposomes, the aqueous QD-laden liposomes (named as LipQDs) were fabricated, allowing further exploration of bio-application. Finally, after further decorating with isolated macrophage membrane, the resulting LipQDs@M nanocomposites were observed to target actively postoperative tumor inflamed tissue (or other inflamed tissues), using an in vivo small animal IR optical imaging system. Our results indicate that these NIR-emitting CuFeS2/ZnS QDs should be a new promising fluorescent marker for biomedical optical imaging, as an alternative for Cd-, Hg-, and Pb-based ones.
研究领域:
生物医学工程
·
材料科学
·
光学成像
✓ 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）