CRYSTENGCOMM
·
2014
·Vol. 16
·期 40
·9501-9505
·
IF 3.858
Yejun Zhang,Shuling Shen,Qiangbin Wang
High quality Ag2S–CdS heteronanostructures were prepared via a facile one-pot method, which is based on the co-thermal decomposition of two single-source precursors of (C2H5)2NCS2Ag and ((C2H5)2NCS2)2Cd in a mixture of oleylamine and oleic acid. Ag2S–CdS heteronanostructures with spherical and matchstick-like structures can be easily obtained in high yields by careful control of the growth kinetics. It was found that oleic acid is conducive to the formation of spherical Ag2S–CdS heteronanostructures and oleylamine helps towards the formation of matchstick-like Ag2S–CdS heteronanostructures. Variable-temperature powder X-ray diffraction studies confirmed the heteroepitaxial growth of CdS on tiny Ag2S nanocrystals, in which the Ag2S nanocrystal plays a catalytic role in the epitaxial growth of the CdS segments.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
Materials Research Express
·
2021
·Vol. 8
·期 4
·045508
·
IF 1.62
Fengpo Yan,Fugui Yang,Hao Zhang,Peihui Luo
Silver sulfide, cadmium sulfide and nickel (Ag2S/CdS/Ni) ternary nanostructures were fabricated by a two step process and characterized by x-ray powder diffraction, transmission electron microscopy, and UV–vis diffuse reflection spectroscopy. The photocatalytic hydrogen production activity of ternary nanostructures and reference samples were evaluated using triethanolamine (TEOA) as sacrificial reagent in water under visible-light illumination (λ ≥ 420 nm). The result shows Ag2S/CdS/Ni nanostructures exhibited a high visible light photocatalytic H2 evolution rate of 1.54 mmolh−1 g−1, which was 4.6 times and 1.4 times higher than that of 1.2% mol Ag2S/CdS and Ni/CdS. The degree of photocorrosion of CdS were employed to study the photogenerated carriers transfer route by measuring and comparing the concentration of Cd2+ in the solution of the photocorrosion experiments in a nonsacrificial system. A long-range electric field, which is similar to the p-i-n electric field structure, was proposed to be constructed by Ni nanoparticles and Ag2S nanoparticles in CdS. Most of the photogenerated electrons and holes in CdS drift to the electron donor and electron acceptor respectively under the action of long-range electric field, which greatly improves the separation efficiency of photogenerated carriers and the photocatalytic H2 production activity.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
Molecular Catalysis
·
2024
·
IF 3.9
Fangfang Huang,Xinyin Zhang,Yuhong Chang,Wenwen Chen,Haishun Wu,Lei Li,Jianfeng Jia
Semiconductor photocatalytic organic reactions have garnered extensive interest owing to their environmentally friendly and sustainable advantages. Herein, the preparation of Ag 2 S@CdS p-n heterojunction through in-situ ion exchange reaction for photocatalytic benzylamine coupling is reported. Compared with pure CdS, Ag 2 S@CdS exhibited significantly enhanced photocatalytic activity for the oxidative coupling reaction of benzylamine. In particular, Ag 2 S@CdS showed high photocatalytic benzylamine conversion (>99 %) after 90 min under sunlight irradiation. The photocatalytic performance test at different wavelengths shows that the broadening of the light absorption range of Ag 2 S@CdS effectively improves the utilization of visible light. The photoelectric performance test demonstrates that the internal electric field of the p-n heterojunction effectively enhances the efficiency of separating photogenerated carriers. Moreover, Ag 2 S@CdS exhibited excellent compatibility with various benzylamine derivatives. The mechanism of photocatalytic benzylamine oxidation by Ag 2 S@CdS was investigated. This work provides some insights into the design of visible-light photocatalysts for selective organic synthesis.
研究领域:
材料科学
·
有机合成
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2018
·Vol. 148
·期 9
·2765-2776
·
IF 2.911
Chang Libin,Zhu Gangqiang,Lu Huan,Hojamberdiev Mirabbos,Zhang Zengping,Gao Jianzhi,Wang Chenghui,Yang Woochul
Abstract The Ag 2 S/CdS composite photocatalyst with a leaf-like structure was synthesized by loading the Ag 2 S nanoparticles on the surface of the hydrothermally synthesized CdS particles. The UV–Vis–NIR absorption spectroscopy results reveal that the Ag 2 S/CdS composite photocatalyst exhibits a wide-spectrum response from ultraviolet (UV) to near-infrared (NIR), demonstrating its potential for effective utilization of solar energy. The scanning and transmission electron microscopic observations show that Ag 2 S nanoparticles with the size of about 20 nm are successfully embedded on the surface of leaf-like structure of CdS. Among the samples loaded with different molar percentages of Ag 2 S nanoparticles, the 5%-Ag 2 S/CdS composite photocatalyst exhibits a higher photocatalytic efficiency than the individually synthesized CdS and Ag 2 S for the degradation of Rhodamine B (RhB) and methyl orange (MO) under LED visible light irradiation. Furthermore, the 5%-Ag 2 S/CdS composite photocatalyst also exhibits a photocatalytic activity for the degradation of RhB under 850 and 940 nm monochromatic light irradiation. The results of the photocatalytic activity tests performed with various scavengers confirm that ·O 2 − plays a key role in the photodegradation of RhB. An enhanced photocatalytic performance of the Ag 2 S/CdS composite photocatalyst is directly attributed to the formation of a heterojunction between Ag 2 S and CdS. The developed composite photocatalyst can harness a greater share of the solar spectrum from visible to near infrared region and generate the photoinduced charge carriers more efficiently. Graphical Abstract
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2014
·Vol. 6
·期 19
·11147-11156
·
IF 6.739
Guoxing Zhu,Chunlin Bao,Yuanjun Liu,Xiaoping Shen,Chunyan Xi,Zheng Xu,Zhenyuan Ji
Developing hybrid nanocrystals is a hot topic in materials science. Herein, a ternary hybrid nanocrystal, Ag–Ag2S–CdS, combining near infrared emission and photothermal conversion properties was demonstrated. The ternary Ag–Ag2S–CdS hybrid nanocrystals with cubic shape and uniform size were synthesized by a simple one-pot and one-step colloidal method. The growth process is self-regulated with the formation order of Ag2S, Ag, and CdS, sequentially. The formation of Ag originates from the partial reduction of Ag2S, while the formation of CdS is through an Ag2S catalytic mechanism based on its superionic feature. The obtained ternary hybrid nanocrystals show near infrared emission and photothermal conversion properties in a lab-on-a-particle system. Importantly, an enhanced effect is observed for the photothermal conversion, which is mainly due to the presence of heterointerfaces among the crystals. This work will not only advance the synthesis chemistry of multi-component hybrid nanocrystals but also provide a possible route for the design of advanced multi-model materials used in bio-related fields.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 45
·28211-28222
·
IF 3.361
Congrong Lu,Shiwen Du,Yanfei Zhao,Qi Wang,Kuankuan Ren,Chunhe Li,Weidong Dou
The low separation efficiency of photogenerated charges and severe photocorrosion seriously impeded the application of CdS in photocatalytic water splitting. Here we report new routes to improve the photocatalytic performance of CdS nanowires (NWs) by decorating with Ag2S nanoparticles, so Ag2S/CdS heterojunction is constructed. The Ag2S/CdS heterojunction exhibited optimal photocatalytic H2 evolution rate of 777.3 μmol h−1 g−1, which is 12.1 times higher than that of pure CdS. The intrinsic characteristics of Ag2S/CdS nanocomposites, such as structure, optical properties, and surface chemical state are systematically studied by experimental characterizations and theoretical calculations. The comprehensive analysis demonstrates that the heterojunction between Ag2S and CdS accelerates photoinduced electrons transfer from CdS to Ag2S, enhancing their ability for water splitting. Meanwhile, the holes on the valence band of CdS react with the sacrificial agents, thus leading to the efficient separation of photogenerated electron–hole pairs. This work offers a simple route to synthesize one-dimensional CdS-based nanocomposites for efficient energy conversion driven by visible light.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2015
·Vol. 15
·期 7
·5087-5092
·
IF 1.556
Zhao Yanmeng,Zhang Zhongping,Sun Dapeng,Li Guangqiang,Lan Xinzheng,Jiang Yang
We explored a facile routine to synthesize morphology-controlled Ag2S–CdS heterostructures. The heterostructures were achieved by a two-step method where CdS nanorods were prepared in the first step, acting as the substrates inducing successive cation exchange reaction
between Cd2+ and Ag+ ion. The nucleation sites of Ag2S can be readily controlled by varying the feed ratios of Ag+ to Cd2+ ion, thus leading to formation of heterostructures with different morphology where Ag2S particles grow
on the tips of the CdS rods, or at multiple locations across the nanorods. HRTEM analysis showed that Ag2S particles were grown on the varied sites of CdS rods with a coherent, quasi-epitaxial interface having different degrees of lattice mismatch. Photoluminescence results showed
that, compared to bare CdS nanorods, enhanced trap emissions were observed after the growth of Ag2S particles on the rods, which can be attributed to the strained interfaces instead of impurities doping.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2013
·Vol. 43
·期 10
·3990-3998
·
IF 3.806
Junli Wang,Hui Feng,Kangmin Chen,Weiling Fan,Qing Yang
A facile catalytic growth route was developed for the low-temperature solution synthesis of Ag2S–CdS matchstick-like heteronanostructures in oleylamine, which are composed of a Ag2S spherical head and a CdS rod-like stem. Ag2S nanoseeds acted as an effective catalyst for the growth of CdS nanorods and remained at the tip of the resultant nanorods, leading to the formation of Ag2S–CdS heterostructures with a matchstick shape. The diameter of the Ag2S heads and the length of the CdS stems could be easily controlled by varying the molar ratios of the Ag/Cd precursors. The differential scanning calorimetry (DSC) and variable-temperature X-ray diffraction (XRD) studies confirmed that Ag2S catalytic seeds underwent a phase change, that is, they were in a high-temperature superionic conducting cubic structure during the CdS nanorod growth and then converted to a low-temperature monoclinic crystal structure as the reaction was cooled to room temperature. The influence of synthetic temperature on the product morphology was investigated and the morphological evolution at different growth stages was monitored using transmission electron microscopy (TEM). Furthermore, the growth kinetics of the Ag2S–CdS matchstick-like heteronanostructures, including the dissolution, nucleation and growth of CdS within the Ag2S catalyst, was reasonably discussed on the basis of the structural characteristics of the superionic cubic Ag2S catalyst and the low solubility of CdS in Ag2S derived from the Ag2S–CdS binary phase diagram.
研究领域:
材料化学
·
纳米科学与技术
·
无机化学
·
物理化学
·
半导体材料
✓ 已验证
DOI
高影响因子
CRYSTAL RESEARCH AND TECHNOLOGY
·
2014
·Vol. 49
·期 6
·431-434
·
IF 1.164
Chunlin Bao,Guoxing Zhu,Mengqi Shen,Miaomiao Liu,Peng Xiao
A facile microwave-assistant route was developed for the synthesis of hybrid nanocrystals. Colloidal hybrid nanocrystals, Ag 2 S-CdS, were prepared by using Ag 2 S nanocrystals and cadmium diethyldithiocarbamate as raw materials under microwave irradiation. The fast ion conductor, Ag 2 S nanocrystal, catalyzes the growth of CdS nano-building blocks through a quasi solution-solid-solid mechanism. The ultraviolet-visible absorption and photoluminescence spectra of the Ag 2 S-CdS hybrid nanocrystals were investigated. One of the main advantages for this synthesis is the efficiency of dramatically reducing overall processing time. This report provides a new route for the growth of semiconductor hybrid nanocrystals based on Ag 2 S and may be extended to the preparation of other hybrid colloidal nanostructures.
研究领域:
材料科学
·
纳米技术
·
化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）