SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Bing Zhang,Hongyun Meng,Xue Wang,Honghong Chang,Wenlong Wei
Mercuric ion (Hg 2+ ) as one kind of environmental pollutants has attracted more and more attentions due to its persistence, mobility and biological enrichment. In this study, a novel photoelectrochemical biosensor for Hg 2+ detection was constructed based on dye sensitization effect induced by Y-shaped DNA transformation as signal amplification strategy. Firstly, graphene oxide-ZnO-CdS nanohybrid (GO-ZnO-CdS) as photoelectric material was synthesized by simple hydrothermal method, and was employed to modify ITO electrode. Secondly, Y-shape DNA was labeled by Au NPs in the solution, and which crosslinked on the surface of GO-ZnO-CdS modified ITO electrode by carbodiimide coupling method, which resulted in the excitation energy transfer (EET) effect between Au NPs and CdS. Finally, in the presence of Hg 2+ , the structure of DNA on the modified electrode changed from Y-shape into hairpin accompanying the proximity of dye molecule based on T-Hg 2+ -T, which eliminated EET effect and triggered dye sensitization effect for enhancing photocurrent response. Under optimal conditions, the photocurrent linearly increased with the increasing of Hg 2+ levels in the range of 5 pM − 500 pM with the detection limit of 1:5 pM(LOD = 3σ blank / s ). More importantly, the developed biosensor showed the advantages of acceptable selectivity, repeatability and stability.
研究领域:
环境科学
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生物传感
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
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2013
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IF 1.304
Qian Mi,Daiquan Chen,Juncheng Hu,Zhengxi Huang,Jinlin Li
A novel N-doped graphene/CdS hollow sphere nanocomposite photocatalyst was synthesized by a simple, template-free one-pot method. The samples were characterized by X-ray diffraction, transmission electron microscopy, Fourier transform infrared spectroscopy, ultraviolet-visible diffuse reflectance spectroscopy, N 2 adsorption-desorption, photoluminescence spectroscopy, and X-ray photoelectron spectroscopy. Photocatalytic degradations of methylene blue and salicylic acid were carried out to evaluate the photocatalytic activity of the nanocomposites under visible light irradiation. The N-graphene/CdS nanocomposites exhibited excellent stability and high photocatalytic activity, exceeding those of graphene oxide/CdS hollow sphere nanocomposites and pure CdS hollow spheres. This excellent photocatalytic activity of the nanocomposite was due to N-graphene acting as an excellent electron acceptor and transporter, thus reducing charge carrier recombination. It was also found that • OH acted as the main reactive species in the degradation of methylene blue under visible-light irradiation.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2012
·
IF 3.461
Xiao-Liang Mao,Dong-Xing Xu,Ming-Lai Fu,Baoling Yuan,Jian-Wen Shi,Hao-Jie Cui
Zn 2 GeO 4 nanobelts modified by CdS quantum dots (Zn 2 GeO 4 /CdS) were prepared successfully by chemical bath deposition. The novel photocatalyst was characterized by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy and UV–Vis diffuse reflectance spectroscopy. It was found that Zn 2 GeO 4 /CdS consisted of uniform rhombohedral phase Zn 2 GeO 4 nanobelts with highly dispersed cubic phase CdS quantum dots, and the Zn 2 GeO 4 /CdS exhibited strong visible light absorption at about 510 nm. The photocatalytic activities of the catalysts were evaluated by the discoloration of Rhodamine B under visible light illumination and were compared with that of pure Zn 2 GeO 4 nanobelts. The results suggested that the composite photocatalyst had much higher photocatalytic activities than pure Zn 2 GeO 4 nanobelts under irradiation of visible light. Meanwhile, no obvious deactivation of Zn 2 GeO 4 /CdS was observed after the three recycles experiments in photodegradation of RhB. The possible mechanism of visible light photocatalytic degradation is also proposed.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
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2016
·
IF 4.803
Ting Shen,Jianjun Tian,Lili Lv,Chengbin Fei,Yajie Wang,Tönu Pullerits,Guozhong Cao
Mn-doping into CdS quantum dots (QDs) has been demonstrated a useful way to enhance the power conversion efficiency (PCE) of quantum dot sensitized solar cells (QDSCs), the detailed systematic study is needed to get a better fundamental understanding. This work focuses on the study of the effects of Mn dopant on light harvesting, charge transfer, and charge collection of the solar cells. The results indicate that the Mn-doping into CdS QDs increases the light absorbance and extends the light absorption range, which results in the enhancement of the photo-generated current density. In addition, both the electron transport rate and the electron diffusion length are also increased with the introduction of Mn dopant. So the charge collection efficiency ( η cc ) of the solar cell increases from 89.9% for CdS sample to 96.7% for Mn/CdS sample. As a result, the PCE of Mn/CdS QDSC reaches 3.29%, which is much higher than that of CdS QDSC (2.01%).
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
ANALYST
·
2012
·Vol. 137
·期 16
·3697-3703
·
IF 4.23
Xiaomei Zhao,Shiwei Zhou,Qingming Shen,Li-Ping Jiang,Jun-Jie Zhu
A novel glutathione (GSH) photoelectrochemical biosensor was fabricated using the newly synthesized graphene–CdS (GR–CdS) nanocomposites. The GR–CdS nanocomposites were prepared by a fast, one-step, aqueous reaction. The as-prepared GR–CdS structure inherited the excellent electron transport of GR and facilitated the spatial separation of photo-generated charge carrier, therefore resulting in the enhanced photocurrent, and making it a promising candidate for developing photoelectrochemical biosensors. The proposed GSH sensor displays satisfactory analytical performance with an acceptable linear range from 0.01 to 1.5 mmol L−1 with a detection limit of 0.003 mmol L−1 at a signal-to-noise ratio of 3, and also shows an excellent specificity against anticancer drugs and can be successfully applied for GSH detection in real samples. The as-synthesized GR–CdS nanocomposites exhibited obviously enhanced photovoltaic properties, which could be extended to the detection of other enzymes and biomolecules, thus providing a promising platform for the development of photoelectrochemical biosensors.
研究领域:
生物传感
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材料科学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2017
·Vol. 19
·期 6
·982-993
·
IF 3.474
Yadong Meng,Yuanzhi Hong,Changyou Huang,Weidong Shi
Novel Z-scheme InVO4/CdS heterojunction photocatalysts have been successfully synthesized for the first time via a microwave-assisted process, followed by a mild hydrothermal method. The crystal structures, morphologies and sizes, chemical compositions and optical properties of the prepared photocatalysts were characterized via X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectroscopy (DRS), and photocurrent measurements. Results showed that the prepared InVO4/CdS heterojunctions were composed of about 15 nm InVO4 nanoparticles and 1.5 μm CdS microspheres, and all heterojunctions exhibited good photoabsorption in the visible light region. The photocatalytic activity of the obtained samples was carefully evaluated via the degradation of rhodamine B (RhB) and ciprofloxacin (CIP) under visible light irradiation (λ > 420 nm). Compared to that of bare InVO4 and CdS, the InVO4/CdS heterojunctions exhibited significantly enhanced photocatalytic activity for RhB and CIP degradation. Moreover, the 40 wt% InVO4-coupled CdS composite displayed the highest catalytic efficiency for RhB photodegradation, which is about 59.4 and 4.8 times higher than that of pure InVO4 and CdS, respectively. In addition, the active species trapping experiment and electron spin resonance (ESR) measurement demonstrated that h+ and ˙O2− radicals were the predominant active species in the photocatalytic reaction process. Furthermore, the possible enhanced photocatalytic mechanism of InVO4/CdS heterojunctions was also proposed based on the band position measurements and ESR analysis.
研究领域:
材料科学
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纳米技术
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环境化学
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光催化
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无机合成
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
·
IF 24.319
Xianglin Xiang,Bicheng Zhu,Jianjun Zhang,Chenhui Jiang,Tao Chen,Huogen Yu,Jiaguo Yu,Linxi Wang
The sluggish oxygen evolution reaction (OER) is often the bottleneck of photocatalytic overall water splitting, greatly suppressing the hydrogen-production activity. Herein, the slow OER was replaced by selective benzyl alcohol (BA) oxidation to benzaldehyde (BD) to promote H 2 production. The photocatalytic reaction was conducted over CdS quantum dots , which were modified with Co 2+ hole cocatalysts to further accelerate the rate-limiting BA oxidation. The photocatalytic system exhibits an ultra-high H 2 -production rate of 257.8 mmol g −1 h −1 with a remarkable apparent quantum yield of 69.3% under 365-nm light irradiation. The high performance is attributed to the Co 2+ hole cocatalysts on CdS surfaces, which not only enhance light absorption but also facilitate photogenerated carrier transfer. More importantly, both photogenerated electrons and holes are fully utilized in meaningful reactions. This work exemplifies a bifunctional photocatalytic system for simultaneous production of self-separated hydrogen and benzaldehyde, both of which are important industrial products.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
Nanomaterials
·
2018
·Vol. 8
·期 6
·415
·
IF 3.504
Wei Li,Hao Ding,Hua Ji,Wenbin Dai,Jianping Guo,Gaoxiang Du
A photocatalytic active CdS-TiO2heterostructure composite was prepared by hydrothermal method and its morphology and properties were characterized. Results indicate that the CdS nanoparticles deposited on the surface of a TiO2nanoparticles, which was in anatase phase. The particle scale of both of the components reached approximately 15 nm. In comparison to pure TiO2(410 nm), the light absorption edge of the heterostructure composite was 550 nm, which could extend the light response from UV to the visible region. Under visible light irradiation, the degradation efficiency of tetracycline hydrochloride by the CdS-TiO2composite achieved 87.06%, significantly enhancing photocatalytic activity than the as-prepared pure TiO2and commercial TiO2(Degussa P25). This character is attributed to the synergetic effect of these two components in the absorption of visible light.Keywords:CdS-TiO2heterostructure composite;photocatalyst;tetracycline hydrochloride
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
·
2014
·
IF 1.968
Yan Liang,Jiawei Tan,Jiexin Wang,Jianfeng Chen,Baochang Sun,Lei Shao
Erythorbic acid assistant synthesis of CdS quantum dots (QDs) was conducted by homogeneous mixing of two continuous liquids in a high-throughput microporous tube-in-tube micro-channel reactor (MTMCR) at room temperature. The effects of the micropore size of the MTMCR, liquid flow rate, mixing time and reactant concentration on the size and size distribution of CdS QDs were investigated. It was found that the size and size distribution of CdS QDs could be tuned in the MTMCR. A combination of erythorbic acid promoted formation technique with the MTMCR may be a promising pathway for controllable mass production of QDs.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Zichao Lian,Pengpeng Xu,Wenchao Wang,Dieqing Zhang,Shuning Xiao,Xin Li,Guisheng Li
Fullerene (C60) enhanced mesoporous CdS/TiO2 architectures were fabricated by an evaporation induced self-assembly route together with an ion-exchanged method. C60 clusters were incorporated into the pore wall of mesoporous CdS/TiO2 with the formation of C60 enhanced CdS/TiO2 hybrid architectures, for achieving the enhanced photostability and photocatalytic activity in H2 evolution under visible-light irradiation. Such greatly enhanced photocatalytic performance and photostability could be due to the strong combination and heterojunctions between C60 and CdS/TiO2. The as-formed C60 cluster protection layers in the CdS/TiO2 framework not only improve the light absorption capability, but also greatly accelerated the photogenerated electron transfer to C60 clusters for H2 evolution.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF STRUCTURAL CHEMISTRY
·
2022
·
IF 0.847
Wei Fu,Jiajie Fan,Quanjun Xiang
ABSTRACT The production of renewable fossil fuels such as CH 4 and CO by photocatalytic CO 2 reduction has attracted more and more attention. However, single photocatalyst is less efficient for photocatalytic reduction of CO 2 due to the fast recombination of photogenerated electron pairs. Herein, we successfully prepare CdS-Ag 2 S composite by assembling the Ag 2 S QDs cocatalyst on the surface of CdS nanosheet-assembled flower through oil-bath solvothermal method . This composite is prepared through a simple self-assembly strategy using cadmium chloride, ammonia and thiourea as precursors of the CdS nanosheet-assembled flower and silver nitrate and 3-mercaptopropionic acid as the precursors of Ag 2 S QDs. The average diameter of Ag 2 S QDs is apparently 6.0 nm. The light absorption edge of the composite is at around 560 nm, with the corresponding band gap at 2.14 eV. The CdS-Ag 2 S QDs composite with 5 wt% Ag 2 S QDs loaded achieves CO evolution rate of 16.6 μmol•g −1 •h −1 without noble-metal cocatalysts. This strengthened photocatalytic performance and photocatalytic stability were attributed to the energy band broadening of Ag 2 S QDs caused by quantum size effect and the large specific surface area due to the assembled flower. The mechanism underlying the enhanced photocatalytic CO 2 reduction activity is further proposed. This study demonstrates that semiconductor-based quantum dots are strong candidates for excellent cocatalysts in photocatalysis .
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
MATERIALS RESEARCH BULLETIN
·
2018
·
IF 2.873
Tianyu Zhao,Zipeng Xing,Ziyuan Xiu,Zhenzi Li,Liyan Shen,Yan Cao,Mengqiao Hu,Shilin Yang,Wei Zhou
CdS quantum dots (QDs)/Ti 3+ -TiO 2 nanobelts heterojunctions as 0D/1D architectures are fabricated through hydrothermal-chemical bath deposition combine with in-situ solid-state chemical reduction approach. The CdS QDs of ∼7 nm are loaded on TiO 2 nanobelts with width of 50–300 nm and several micrometers long, and the heterojunctions are formed efficiently. The prepared heterojunctions exhibit excellent photocatalytic performance for complete removal of methylene blue (∼99%) and hydrogen production efficiency (∼480.6 μmol h −1 ) under visible light irradiation, which are as high as 2 and 23 times than that of pristine TiO 2 nanobelts. The enhancement is attributed to the Ti 3+ self-doping and CdS QDs extend the photoresponse to visible light region and the formation of heterojunctions favor the spatial separation of photogenerated charge carriers. Therefore, the high-efficient 0D/1D heterojunction composites have potential applications in the field of environment and energy.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
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