CHEMPHYSCHEM
·
2015
·Vol. 16
·期 13
·2826-2835
·
IF 3.419
Shiwei Zhou,Yingying Wang,Ming Zhao,Li-Ping Jiang,Jun-Jie Zhu
Graphical Joining the dots: A core–shell–shell CdSeTe@CdS@ZnS quantum-dot-sensitized macroporous TiO 2 plate is built as a photoelectrochemical signal output system, and the film is modified further with biotin–DEVD–peptide, which can be cleaved specifically by caspase-3 and streptavidin-labeled alkaline phosphatase (SA-ALP), to assemble a multisignal-amplified photoelectrochemical platform. A macroporous TiO 2 film (M-TiO 2 ), which was prepared by burning off the polystyrene microsphere (PS) template from a PS/TiO 2 composite film, can provide a large active surface, improve electron-transport performance, and increase the photocurrent. Furthermore, core–shell–shell CdSeTe@CdS@ZnS quantum dots (QDs) were introduced to sensitize the M-TiO 2 film, which can efficiently broaden the absorption spectra range, separate and transfer charge carriers, reduce recombination loss, and improve photovoltaic response, with a sensitization shell of CdS and a passivation shell of ZnS. A multisignal-amplified photoelectrochemical platform was fabricated by further modifying this film with a combination of biotin–DEVD–peptide (Biotin–Gly–Asp–Gly–Asp–Glu–Val–Asp–Gly–Cys) (which is specifically cleaved by caspase-3) and streptavidin-labeled alkaline phosphatase (SA-ALP). Under the enzymatic catalysis of ALP with the substrate 2-phospho- L -ascorbic acid trisodium salt (AAP), ascorbic acid (AA) was generated as a better electron donor, leading to increased photocurrent output. The activity of caspase-3, which depends on the amount of residual peptide on the electrode, was inversely proportional to the amount of AA. By monitoring the variation of photocurrent caused by AA, caspase-3 activity and the therapeutic effect of nilotinib (a special medicine of chronic myeloid leukemia, CML) were indirectly detected and evaluated. The photoelectrochemical platform can be used as a potential evaluation system for monitoring caspase-3 activity and drug effects.
研究领域:
生物医学工程
·
光电化学
✓ 已验证
DOI
PubMed
高影响因子
Micro & Nano Letters
·
2020
·Vol. 15
·期 9
·595-599
·
IF 0.975
Dezhi Qin,Guangrui Yang,Yabo Wang,Jiajia Zhang,Li Zhang
Pectin-conjugated CdS/ZnS core/shell nanocrystals were prepared by using a microwave-assisted approach without the addition of any external ligands. The prepared cubic phase CdS/ZnS nanocrystals were uniform and mono-dispersed with sizes of 6–9 nm. The charge and long-chain structure of pectin molecules effectively prevented the aggregation of CdS/ZnS nanocrystals. In addition, pectin molecules have multiple functional groups, such as O–H, C=O, and COO − , which could conjugate with the surface of samples to control the growth of CdS/ZnS nanocrystals. Thermogravimetric analysis provided evidence that the obtained products are inorganic–organic hybrid materials. Based on the analysis of ultraviolet–visible spectra, it was found that the formation of ZnS shell led to a red-shift and an enhancement of absorption of CdS/ZnS nanocrystals compared with that of CdS. Photocatalytic activity of CdS/ZnS nanocrystals was monitored by the degradation of Rhodamine B under visible light irradiation. The presence of ZnS shell inhibited photo-corrosion and photo-dissolution of CdS nanocatalyst, thus resulting in a significant enhancement of photocatalytic activity and stability.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 27
·12227-12234
·
IF 2.7
Yi Zheng,Qiaoling Chen,Wenjing Zhang,Chongwen Zhang,Rong Ma,Chunlei Li,Jing Zhang
The photocatalytic hydrogen evolution half-reaction (HER) is a promising technology for meeting future energy demands. An excellent photocarrier separation is essential for the HER. Here, a CdS/ZnS composite (CZS) with a dual photocarrier separation channel has been synthesized using the epitaxial growth method to achieve this aim. XRD and TEM show that pre-adsorption of S2− on the CdS surface facilitates the conversion of CdS into ZnS with a larger solubility product, implying a good carrier transport channel between CdS and ZnS. Based on XPS, PL, and photo-deposition experiments, a dual-channel photocarrier separation mechanism has been proposed, which is the source of the great photocarrier separation, and thus the hydrogen evolution rate of the CZS-2 sample (22.05 mmol g−1 h−1) becomes 18.5 and 73.5 times higher than those of CdS and ZnS. The apparent quantum yield (AQY) of CZS-2 at 420 nm is 4.68%.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Haodong Sun,Zuoyi Xiao,Zhenyu Zhao,Shangru Zhai,Qingda An
Accelerating the charge separation efficiency is a crucial approach to improve the photocatalytic performance of semiconductors. The design and synthesis of heterojunctions can effectively inhibit the recombination of photogenerated electron-hole pairs and enhance the charge separation efficiency. In this work, an easy-handling calcination route was proposed to prepare CdS/ZnS heterojunction loaded on honeycomb-like porous carbon (CZS@C) using chitosan as a precursor. The unique honeycomb-like porous structure facilitated the separation and migration of photoexcited electrons and holes, improving the utilization of visible light and shortening the distance of electron transport. The photocatalytic performance of CZS@C was evaluated by the degradation of tetracycline (TC) and H 2 production from water splitting under visible light. The optimized CZS@C composite can degrade almost 92.40 % of TC under visible light irradiation in 60 min. Such CZS@C composite presented an excellent photocatalytic activity with H 2 production rate of 5.49 mmol h −1 g −1 , which was 54.9 and 2.28-folds higher than ZnS@C and CdS@C. Furthermore, the possible photocatalytic reaction mechanism and pathway towards TC degradation and simultaneous H 2 generation was proposed.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 54
·期 11
·8571-8580
·
IF 3.442
Liu Ying,Dai Fangxu,Zhao Ruiyang,Huai Xudong,Han Jishu,Wang Lei
A novel water-soluble core/shell/shell CdSe/CdS/ZnS quantum dot (QD) is prepared and employed as photocatalysts in the water splitting for hydrogen production. The combination of CdSe with CdS shell and ZnS shell effectively enhances the light harvest ability of the photocatalyst in the visible region, facilitates the separation and transfer of photoinduced electrons and holes and inhibits the recombination of photogenerated electron–hole pairs. The results of photocatalytic hydrogen production show that the amount of hydrogen produced by CdSe/CdS/ZnS QDs increases significantly within 7 h compared with CdSe QDs and CdSe/CdS QDs. In addition, the excellent recyclability of the photocatalyst makes it more promising for practical application.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2015
·Vol. 39
·期 7
·5150-5160
·
IF 3.086
Yanfeng Tang,Xinlin Liu,Changchang Ma,Mingjun Zhou,Pengwei Huo,Longbao Yu,Jianming Pan,Weidong Shi,Yongsheng Yan
In this work, reduced graphene oxide (RGO)–CdS/ZnS heterostructure composites have been successfully synthesized by a hydrothermal method by assembling the CdS/ZnS heterostructure nanoparticles on RGO sheets and the reduction of GO occurs simultaneously. The as-prepared RGO–CdS/ZnS composites with the content of 15% RGO exhibit highly active photodegradation of TC. A possible mechanism for the enhanced photocatalytic activity has been discussed. The CdS/ZnS heterostructure facilitates the transformation of electrons, which is excited by light irradiation in the conduction band of CdS. RGO is supposed to be an electron transfer channel, which is used to reduce the recombination of electron–hole pairs, thus enhancing the photo-conversion efficiency. By profiting from the synergy of RGO and CdS/ZnS heterostructure, the photocatalysts not only show a better photocatalytic activity in tetracycline antibiotics but also prevent pure CdS or ZnS from photocorrosion. At last, RGO–CdS/ZnS shows remarkable stability and cyclic performances.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2013
·
IF 4.814
Lei Huang,Xiuli Wang,Jinhui Yang,Gang Liu,Jingfeng Han,Can Li
The photocatalytic activity and stability of nanocrystals (NCs) are two important issues for their application in photocatalysis. In this work, we report a combined method to promote the photocatalytic activity as well as the stability of CdS NCs for photocatalytic H2 evolution. ZnS shell was grown on CdS NCs forming type I core/shell CdS/ZnS nanocrystals (NCs) to restrain the photocorrosion and passivate the trap states on CdS NCs. Thereafter, dual cocatalysts were loaded to promote the separation and transfer of electrons and holes from the core to outer surface for photocatalytic reactions. It is found that Pt and Ni are effective reduction cocatalysts (RCs) while PdS and PbS are effective oxidation cocatalysts (OCs) for promoting the charge separation and transfer. This strategy was also proved to be effective for other type I core/shell NCs, such as CdTe/CdS/ZnS NCs.
研究领域:
材料科学
·
光催化
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2013
·Vol. 24
·期 20
·205601
·
IF 3.842
Bin Xu,Bing Cai,Ming Liu,Hongsong Fan
This study explored a simple and fast method utilizing ultraviolet (UV) irradiation to synthesize CdTe/CdS/ZnS QDs in aqueous solution. Based on the reaction of photolysis and chemical deposition, the CdS and ZnS shell can be successively deposited around the thiol-capped CdTe cores through the interaction of Cd2+/Zn2+ and S2− produced by UV irradiation. The effect of the UV irradiation time, the ratios of thioglycolic acid (TGA)/Cd and TGA/Zn on the shell formation, shell stability, and the photoluminescence (PL) intensity of the QDs, was systematically investigated. Keeping the ratio of TGA/Cd, increasing UV irradiation time from 30 to 120 s, the blue-shift of the fluorescence emission peak position of CdTe/CdS QDs was observed. As the irradiation time increased continuously from 120 to 300 s, the red-shift of the emission peak position was observed. In the total irradiation time, the PL intensity of all the samples was enhanced. By applying 300 s irradiation on the samples, the emission peak was blue-shifted at a fixed TGA/Cd ratio of 1:1 and red-shifted at the ratios of 2:1, 4:1, 8:1, and 13:1. The PL intensity reached its highest value at the ratio of 2:1. The effect of TGA/Zn ratio on ZnS shell formation showed a similar progress. Under an optimum synthesized reaction condition, the particle sizes of CdTe core, CdTe/CdS core–shell and CdTe/CdS/ZnS core–shell–shell QDs were 2.6 nm, 3.4 nm, and 4.6 nm respectively. This study confirmed that with the core–shell–shell structure, CdTe/CdS/ZnS QDs had high anti-oxidability, photostability, and low toxicity. Therefore they can be further used in cell imaging efficiently.
研究领域:
材料科学
·
生物医学工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Yuan Lin,Qiao Zhang,Yuhang Li,Yunpeng Liu,Kejia Xu,Jiangnan Huang,Xiaosong Zhou,Feng Peng
An incompletely covered CdS/ZnS core/shell is synthesized via a simple hydrothermal method. Due to the defect energy levels introduced by zinc vacancies, the typical type-I heterojunction of CdS/ZnS evolves to a type-II heterojunction and Z-scheme hybrid structure so that the ZnS shell can timely transfer and capture the photogenerated holes from the CdS core. The surface photovoltage (SPV) distribution caused by photogenerated charges on the surface of catalyst is visually presented by Kelvin probe force microscopy with synchronous illumination (microscope SPV). It intuitively proves the effective spatial separation of photogenerated holes from the CdS core to the ZnS shell, for the first time. Under optimal conditions, the highest hydrogen production rate of CdS/ZnS reached 24.1 mmol g–1 h–1 under visible light illumination. The average apparent quantum yield of 9.3% can be achieved for 9 h of illumination (λ = 420 ± 5 nm). It exhibits highly efficient photocatalytic H2 evolution with well stability.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Senyang Wang,Shi Tang,Mengting Hua,Yuxuan Chen,Dantian Zhang,Rao Fan,Ling Li
Raspberry-like double-core shell CdS@ZnS@NiS material was prepared to use a simple one-step hydrothermal method, and then coated uniformly on carbon nanofibers (CNFs), resulting in the formation of highly efficient counter electrode (CE) for Zn-Cu-In-Se (ZCISe) quantum dot sensitized solar cells (QDSSCs). The QDSSCs used CdS@ZnS@NiS/CNFs as CE reached power conversion efficiency (PCE) of 9.72%, which is higher than Cu 2 S/brass (8.42%). This result indicates the dual-core shell structure possesses better catalytic properties, which indicates that the raspberry-shaped double-core shell CdS@ZnS@NiS is a feasible competitor as CE material for QDSSCs.
研究领域:
材料科学
·
纳米技术
·
能源技术
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Jian Liu,Ming Xia,Rong Chen,Xun Zhu,Qiang Liao,Dingding Ye,Biao Zhang,Wei Zhang,Youxu Yu
Photocatalytic fuel cell (PFC) is a promising wastewater treatment technology, which cannot only purify wastewater but also generate electricity using solar energy. In this study, a membrane-less visible-light responsive micro PFC was developed, where the CdS/ZnS-TiO 2 deposited on a conductive glass as a photoanode and CuO deposited on the porous carbon paper as an air-breathing photocathode were laterally arranged. Such design allows for both the photoanode and photocathode to be irradiated simultaneously from one side and enhances photon and mass transport. It was found that the developed micro PFC with dual photoelectrodes well responded to light illumination and exhibited good long-term performance. Experimental results also showed that upgrading the light intensity and methanol and electrolyte concentrations could improve the discharging performance because of larger amount of generated electron-hole pairs and more hole scavengers resulting from the enhanced transport. Besides, it was also found that although the increase of the liquid flow rate from extremely low rate to a moderate one caused the residence time to be lowered, positive contribution resulting from enhanced mass transport was more significant, leading to the improved performance. However, too high liquid flow rate resulted in critical low residence time, which made the discharging performance worse. The feasibility of the developed micro PFC with dual photoelectrodes toward the applications of using solar energy to remove organic pollutants contained in wastewater and simultaneously generate electricity is demonstrated in this work.
研究领域:
环境科学
·
能源技术
·
材料科学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2014
·
IF 3.84
Jing Wang,Na Li,Feng Shao,Heyou Han
Highly luminescent, good stable and low toxic N-acetyl- l -cysteine (NAC) capped CdTe/CdS@ZnS–SiO 2 near-infrared (NIR)-emitting quantum dots (QDs) were successfully fabricated in aqueous solution via a microwave irradiation reduction route, in which thiol-capped CdTe/CdS QDs were employed as core templates and ZnCl 2 , NAC and tetraethyl orthosilicate as shell precursors. This presented ZnS-like clusters filled hybrid SiO 2 model not only greatly improved the brightness and stability of original CdTe/CdS QDs, but also tremendously decreased the cytotoxicity towards HeLa cells. Furthermore, it was found that Hg 2+ could effectively selective quench the QD NIR emission based on electron transfer process. On the basis of this fact, a simple, rapid and specific method for trace Hg 2+ determination was proposed. Under optimal conditions, the fluorescence intensity decreased linearly with the concentration of Hg 2+ ranging from 5.0 × 10 −9 to 1.0 × 10 −6 M and the limit of detection for Hg 2+ was 1.0 × 10 −9 M ( S / N = 3). As practical applications, the novel NIR sensor has been demonstrated to monitor and image Hg 2+ level in milk power and HeLa cells respectively with satisfactory results obtained.
研究领域:
材料科学
·
生物医学
·
分析化学
✓ 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）