CHEMISTRY OF MATERIALS
·
2012
·
IF 7.286
Shuling Shen,Yejun Zhang,Yongsheng Liu,Long Peng,Xueyuan Chen,Qiangbin Wang
Doping semiconductor nanocrystals and integrating disparate components together are two effective ways for modulating the optical properties of semiconductor nanocrystals. For the first time, we successfully synthesized Mn-doped Ag2S-ZnS heteronanostructures (HNSs) by combining these two strategies together. The obtained Mn-doped Ag2S-ZnS HNSs exhibit multicolor emissions of blue, orange, and near-infrared (NIR), in which the blue emission originates from ZnS trap state, the orange emission is induced by the 4T1–6A1 transition in Mn2+ dopant, and the NIR emission is attributed to the band gap emission of Ag2S. Reaction temperature-dependent and Mn2+ dopant concentration-dependent optical properties, as well as the growth kinetics of Ag2S-ZnS HNSs during doping process, were systemically studied to achieve the desirable optical properties and preserve well-defined HNSs simultaneously. We expect that the prepared Mn-doped Ag2S-ZnS HNSs with tunable multicolor emissions will create numerous opportunities for potential applications in bioimaging and optoelectronic devices, and the facile methodology modulating Ag2S-ZnS HNSs with desirable properties will be general and be ready to other complex semiconductor nanostructures.
研究领域:
材料科学
·
生物医学工程
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF INORGANIC BIOCHEMISTRY
·
2021
·
IF 4.155
Xiang Gao,Hongxia Li,Xiaohui Niu,Deyi Zhang,Yi Wang,Haiyan Fan,Kunjie Wang
The present study attempted to synthesize carbon quantum dots (CQDs) through Aldol polymerization reaction , wherein acetone was used as the carbon source. A nano composite CQDs/Ag 2 S/CS was developed by loading as prepared CQDs and Ag 2 S nanoparticles on a chitosan substrate (CS). An in-situation growth of nanocomposites was adopted to study their antibacterial properties . Staphylococcus aureus (Gram-positive), Escherichia coli (Gram-negative) and methicillin-resistant Staphylococcus aureus were selected as the model bacteria. The CQDs/Ag 2 S/CS nanocomposites exhibited excellent inhibition not only against common pathogenic bacteria, but also those well-known drug-resistant bacteria. Moreover, compared to traditional antibiotics, the as prepared nanocomposites in the present work do not likely cause bacterial drug resistance , which make them a potential candidate for a new type of clinically applicable antibiotics.
研究领域:
生物医学工程
·
材料科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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
CHEMISTRY-A EUROPEAN JOURNAL
·
2018
·Vol. 24
·期 51
·13676-13680
·
IF 5.16
Huishan Shang,Qiumei Di,Muwei Ji,Bing Bai,Jiajia Liu,Wenxing Chen,Meng Xu,Hongpan Rong,Jia Liu,Jiatao Zhang
Graphical Tunable nanocrystals . Ternary I-III-VI 2 (AgInS 2 ) colloidal nanocrystals (NCs) with precise control of the composition (from In 3+ doping to ternary composition) and good NIR fluorescence performance (800–1000 nm) have been synthesized by facile low-temperature in situ conversion of colloidal Ag 2 S nanoparticles. In 3+ ions were inserted into the crystal lattice of Ag 2 S NCs at a relatively low temperature as dopant with ternary AgInS 2 NCs obtained at a higher temperature following a phase transition (see figure). Focusing on ternary I-III-VI 2 colloidal nanocrystals (NCs) synthesized with precise control of the composition (from doping to ternary composition) and NIR fluorescence performance, monodisperse binary In 3+ -doped Ag 2 S NCs and ternary AgInS 2 NCs have been achieved successfully by facile low-temperature in situ conversion of colloidal Ag 2 S nanoparticles. In 3+ ions were inserted into the crystal lattice of Ag 2 S NCs at a relatively low temperature as dopant and ternary AgInS 2 NCs were obtained at a higher temperature following a phase transition. These doped Ag 2 S and AgInS 2 NCs based on different indium precursor concentrations were explored with respect to the position and intensity of the near-infrared photoluminescent emission at different doping levels and crystal phase evolution.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2011
·Vol. 13
·期 10
·3515-3520
·
IF 4.006
Chao Zou,Meng Li,Lijie Zhang,Yun Yang,Qiang Li,Xi'an Chen,Xiangju Xu,Shaoming Huang
A facile and inexpensive solution-based synthesis of quaternary AgInZn7S9 nanowires was developed. Structural and compositional characterizations were carried out by transmission electron microscopy (TEM), energy-dispersive spectroscopy (EDS) analysis, and powder X-ray diffraction (XRD). The as-synthesized AgInZn7S9 nanowires have high quality and moderate band structure. The growth mechanism is also investigated. It is confirmed that Ag2S nanoparticles derived from the decomposition of precursor Ag(dedc) act as a catalyst during the growth of quaternary nanowires. The catalysts in this process were found to be in a quasi-liquid state and only the surface region of the catalysts melted, which is different from the liquid state in the typical Solution–Liquid–Solid growth process.
研究领域:
材料科学
·
纳米技术
·
半导体物理
·
溶液化学
·
催化科学
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2023
·
IF 3.7
Zhijie Chen,Chao Wang,Ji Yu,Xingming Yang,Xibin Xu,Min Gu
In this study, Ag2S samples are characterized using X-ray diffraction, X-ray photoelectron spectroscopy, differential scanning calorimetry, and impedance spectroscopy. At 447 K, an AC conductivity jump of about two orders of magnitude is observed, and an endothermic peak is measured by differential scanning calorimetry, apparently resulting from the β-to-α phase transition, i.e., the order–disorder transition. A silver vacancy proportion of 2.2% is obtained by refinement of the X-ray diffraction profile. The dielectric loss peaks and analysis of the observed complex impedance peaks indicate four different relaxation processes, namely, P1, P2, P3, and P4, from low to high temperature. P1 and P2 are obviously the migration of silver ions from two types of lattice sites to their nonequivalent nearest-neighbor vacancies. P3 involves the migration of interstitial silver ions to adjacent interstitial sites. An Arrhenius-to-VFTH crossover of the P4 relaxation time is inferred to the hopping of the individual silver ion and then the cooperative jumps of several ions in the disordered region of the silver sublattice upon heating.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
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
Nanoscale
·
2014
·Vol. 6
·期 21
·12580-12590
·
IF 6.739
Haiyan Chen,Bowen Li,Min Zhang,Kang Sun,Yiran Wang,Kerui Peng,Mengdi Ao,Yiran Guo,Yueqing Gu
Nanomedicine platforms that have the potential to simultaneously provide the function of molecular imaging and therapeutic treatment in one system are beneficial to address the challenges of cancer heterogeneity and adaptive resistance. In this study, Cyclic RGD peptide (cRGD), a less-expensive active tumor targeting tri-peptide, and doxorubicin (DOX), a widely used chemotherapeutic drug, were covalently attached to Ag2S quantum dots (QDs) to form the nano-conjugates Ag2S-DOX-cRGD. The optical characterization of Ag2S-DOX-cRGD manifested the maintenance of QDs fluorescence, which suggested the potential of Ag2S for monitoring intracellular and systemic drug distribution. The low biotoxicity of Ag2S QDs indicated that they are promisingly safe nanoparticles for bio-applications. Furthermore, the selective imaging and favorable tumor inhibition of the nanoconjugates were demonstrated at both cell and animal levels. These results indicated a promising future for the utilization of Ag2S QDs as a kind of multi-functional nano platform to achieve imaging-visible nano-therapeutics.
研究领域:
纳米医学
·
肿瘤学
·
生物材料学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2012
·Vol. 19
·期 5
·1732-1739
·
IF 5.925
Zhipeng Huang,Lei Pan,Peng Zhong,Maoying Li,Feng Tian,Chi Zhang
Graphical Bird on a quantum wire : Monodisperse Ag 2 S (or Ag 2 Se) ZnSe quantum wires can be synthesized at 120 °C with the assistance of Ag 2 S. These quantum wires are uniform in structure and morphology and have an aspect ratio of larger than 100. This method can be also used to fabricate CdSe quantum rods. A facile method for the low-cost and large-scale production of ultralong Ag 2 S (or Ag 2 Se) ZnSe quantum wires has been developed. ZnSe quantum wires (diameter≈4 nm) with high uniformity in their crystal structure and diameter can be synthesized by using a catalyst-assisted growth approach with Ag 2 S nanoparticles as a catalyst. The influence of the growth temperature, time, and type of catalytic particle on the morphology of the ZnSe quantum wires was systematically explored. Besides Ag 2 S, Ag 2 Se nanoparticles can also be adopted as the catalyst for the growth of ZnSe wires. This method can also be applied to the fabrication of uniform CdSe nanorods. This method is convenient for the controllable fabrication of metal selenides and is of importance for exploring fundamental nanoscale semiconductor physics, as well as for affording technological devices with optimized characteristics.
研究领域:
材料科学
·
纳米技术
·
半导体物理
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Ke Ye,Tianfu Liu,Yanpeng Song,Qi Wang,Guoxiong Wang
Electrochemical CO 2 reduction reaction (CO 2 RR) offers an appealing route to simultaneously store intermittent renewable energy as value-added chemicals and close carbon cycle. Silver (Ag) catalyst is a promising candidate for the electrochemical conversion of CO 2 to CO, but the electrocatalytic properties are still insufficient for practical applications. Herein, we put forward a strategy to in situ reconstruct a heterogeneous Ag 2 S/Ag interface structure, in which their strong interactions facilitate CO 2 RR performance. The in situ reconstructive Ag 2 S/Ag catalyst achieves a large current density of 421.7 ± 14.4 mA cm –2 at –0.70 V vs . reversible hydrogen electrode (RHE) and maintains steadily at a current density of 244.5 ± 31.8 mA cm –2 and CO Faradaic efficiency of 99.1 ± 0.8 % at –0.49 V vs . RHE for 50 h, superior to state-of-the-art CO-selective Ag-based catalysts. Density functional theory calculations reveal that the in situ reconstructive Ag 2 S/Ag interface active sites stabilize the *COOH intermediate during CO 2 RR process.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2012
·Vol. 3
·期 2
·616-622
·
IF 0
Hui Liu,Weiwei Hu,Feng Ye,Yulong Ding,Jun Yang
Understanding the growth process of nanomaterials enables the control of their sizes/morphologies to enhance their performance for a given application. Herein we report the investigation into the synthesis of Ag2S nanocrystals by reacting Ag+ ions and/or Ag nanoparticles with S powder in a nonpolar organic solvent. The results show that the growth of Ag2S nanocrystals follows a “coalescence–fracture–ripening” mechanism, which is different from the commonly accepted LaMer nucleation growth model. At the initial stage of the reaction, Ag2S nanoclusters are formed on the surface of massive S powders and then coalesce to form extensive network of nanowires, which later are hollowed and fragmented into quasi-spherical particles due to the inside-out diffusion of S in nanowires. The quasi-spherical particles finally grow into uniform Ag2S nanocrystals through a ripening process. It has been found that the Ag2S growth process can be greatly accelerated by increasing the temperature of the reaction system and the sizes/morphologies of the final Ag2S nanocrystals can be easily tuned by varying the molar ratio of the starting precursors.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
ULTRASONICS SONOCHEMISTRY
·
2023
·
IF 8.4
Zongbo Zhang,Changbin Xu,Shiliang Song,Yan Ding,Nan Meng,Xuesheng Liu,Yuan Zhang,Liang Gong,Wenting Wu
Ag 2 S quantum dots (QDs) have aroused extensive concerns in intravital imaging field due to their merits of narrow bandgap, low biological toxicity and decent fluorescence emission properties in the second near-infrared (NIR-II) window. However, low quantum yield (QY) and poor uniformity of Ag 2 S QDs are still main obstacles for its application. In this work, a novel strategy of utilizing ultrasonic field is presented, which can enhance the microdroplet-based interfacial synthesis of Ag 2 S QDs. The ultrasound increases the presence of ions at the reaction sites by enhancing the ion mobility in the microchennels. Therefore, the QY is enhanced from 2.33 % (optimal QY without ultrasound) to 8.46 %, which is the highest value of Ag 2 S ever reported without ion-doping. Also, the decrease of the corresponding full width at half maximum (FWHM) from 312 nm to 144 nm indicates the obvious uniformity improvement of the obtained QDs. Further mechanism exploration illustrates that ultrasonic cavitation significantly increases the interfacial reaction sites by splitting the droplets. Meanwhile, the acoustic flow field strengthens the ion renewal at the droplet interface. Consequently, the mass transfer coefficient increases by more than 500 %, which is favorable to improve both the QY and quality of Ag 2 S QDs. This work serves both fundamental research and practical production for the synthesis of Ag 2 S QDs.
研究领域:
材料科学
·
纳米技术
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）