JOURNAL OF APPLIED PHYSICS
·
2014
·Vol. 115
·期 17
·
IF 2.185
Li S. J.,Li D.,Jiang J. J.,Liu G. B.,Ma S.,Liu W.,Zhang Z. D.
Growth process and magnetic properties of PbO-type α-Fe x Se nanostructures with shape changing from nanocacti to nanopetals and then to nanosheets are investigated. With iron acetylacetonate [Fe(acac) 3 ] and Se powder as raw materials, the diffusion process of Fe atoms dominates the synthesis of α-Fe x Se nanocacti following phase transitions from FeSe 2 to Fe 3 Se 4 and finally to α-Fe x Se. When a mixed solution containing Se precursor and Fe(acac) 3 was used as the raw material, the formation of FeSe 2 and Fe 3 Se 4 can be avoided and, bended α-Fe x Se nanopetals can be prepared at 345 °C, which became flat nanosheets with a [001] preferred orientation as extending the reaction time from 1 to 4 h. No superconducting transition occurs in the α-Fe x Se (0.84 ≤ x ≤ 1.05) nanostructures due to composition heterogeneity or size effect. Magnetic measurements indicate that an antiferromagnetic component with a Néel point at about 45 K dominates the magnetic properties of the α-Fe 0.87 Se nanosheets.
研究领域:
材料科学
·
凝聚态物理
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 22
·18483-18489
·
IF 3.289
Lin Ling,Chan Wang,Kai Zhang,Taotao Li,Lei Tang,Chaowei Li,Liangjie Wang,Yancui Xu,Qijun Song,Yagang Yao
Edge-oriented MoS2 nanopetals complexed with basal-oriented MoS2 thin films have been mildly grown through a simple atmospheric pressure chemical vapor deposition (APCVD) process with the reaction of MoO3 and S. Dense nanopetals with hexagonal structures exposed numerous chemically reactive edge sites. The roles of growth temperature, time and S/MoO3 mass ratio have been carefully investigated to tune the morphology and density of the as-grown products. Importantly, the carbon nanotube (CNT) films were used as substrates for growing MoS2 nanopetals. The MoS2/CNT composites, used directly as working electrodes, showed remarkable and stable electrocatalytic activity in the hydrogen evolution reaction (HER), as manifested with a low onset overpotential of ∼100 mV and a small Tafel slope of 49.5 mV per decade. The development of the MoS2/CNT electrode provides a promising way to fabricate other multifunctional electrodes.
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
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2019
·Vol. 35
·期 5
·924-928
·
IF 1.071
Xiang Siyuan,Meng Qingnan,Zhang Kai,Gu Yue,Liu Wendong,Yang Bai
Using dextran as both reductant and stabilizing agent, nanopetals(ZnO-Au NPs) were easily synthesized and possessed a petal-like morphology. The feature structure and size of such ZnO-Au NPs were adjustable by regulating the amount of chloroauric acid(HAuCl 4 ). Moreover, the electrochemical property of the obtained NPs was evaluated by being immobilized on the glassy carbon electrode(GCE), which performed both high sensitivity and stability in dopamine(DA) determinations. Furthermore, the as-prepared ZnO-Au NPs could also detect DA and uric acid(UA) simultaneously in the mixture without interference, indicating good selectivity and showing promising potential in biosensing.
研究领域:
材料科学
·
生物传感
·
分析化学
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2023
·Vol. 11
·期 14
·2300188
·
IF 9
Xinyuan Bi,Zhening Fang,Binge Deng,Lei Zhou,Jian Ye
Raman-fluorescence dual-mode enhanced nanoparticles have enormous potential for bioimaging with combined advantages of sensitivity and speed. This is primarily achieved through a trade-off between fluorescence quenching and electromagnetic (EM) enhancement on the plasmonic metal surface, as demonstrated in previous research. A strategy that can minimize EM-field attenuation and temporal photobleaching would be highly desirable. In this study, a novel approach using Raman-fluorescence enhanced dual-mode nanoparticles with the near-infrared fluorescence reporter IR780 directly embedded in the ultra-high EM fields between gold (Au) nanopetals of various morphology and a silver (Ag) coating without a spacer is presented. The results show these nanoparticles to be single-nanoparticle Raman sensitive and that they can generate a fluorescence enhancement factor as high as 1113 experimentally and 2000 by numerical simulation. The random morphology of the nanopetals supports broadband resonances for both fluorescence excitation and emission, resulting in nanowatt detectability, the dual-mode photostability of more than 30 min under continuous laser irradiation, and a long shelf life, making them promising for wide applications in bioimaging with ultra-brightness, low laser power, and long-duration monitoring. In summary, they represent a novel strategy for high-performance Raman-fluorescence enhancement dual-mode nanotags.
研究领域:
纳米技术
·
生物医学工程
·
光学成像
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2018
·Vol. 14
·期 27
·1800090
·
IF 9.598
Lianshan Sun,Chunli Wang,Xuxu Wang,Limin Wang
Controllable synthesis of functional materials is of widespread interest for particle engineering. Such a method has not been widely promoted due to the lack of recognition of the fundamental principle, especially for organic–inorganic hybrid materials. Here, as an entrance, the controllable synthesis of Mo-polydopamine coordination flowers is realized through a facile foaming method, and a 2D nanopetal as the building monomer of the flower is synthesized. Depending on the morphology evolution of Mo-dopamine complex under different conditions, and the surface iterative topology growth of the Mo-polydopamine petal, the reasons of why the Mo-polydopamine complex self-assembles into a flower structure can be attributed to the synergistic effect of multicore symbiosis and structural self-protective growth behaviors. Benefiting from the strong structure stability of the Mo-polydopamine nanopetal, a hybrid structure of MoO 2 quantum dot in situ anchoring in the N-doped 2D carbon framework is prepared by direct pyrolysis, which shows a highly reversible performance in application for lithium-ion secondary batteries (LIBs). This work enhances the possibility for the controllable synthesis of organic–inorganic hybrid materials by adjusting the multicore intergrowth and inhibiting the interfacial assembly.
研究领域:
材料科学
·
化学工程
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Wenxiu He,Hengrui Qiu,Jing Meng,Bin Liu,Jinlong Cui,Yongqiang Zhang
A nanoscale petal-like α-Ni(OH) 2 /reduced graphene oxide (α-Ni(OH) 2 /RGO) composite was synthesized with the one-step microwave method. α-Ni(OH) 2 particles with sizes of approximately 200 nm are uniformly distributed on the reduced graphene oxide sheet in the sample. When used as an electrode for alkaline rechargeable batteries, the discharge capacity of the α-Ni(OH) 2 /RGO composite reaches 333.5 mAh/g at 0.2C and 247.1 mAh/g at 10 C, respectively, with an excellent rate capability. After 2000 cycles, the capacity of the electrode is insignificantly attenuated, indicating a high capacity retention and cycling stability. The outstanding electrochemical properties are attributed to the nanoscale petal-like structure α-Ni(OH) 2 anchoring on the RGO sheets, which facilitates ion diffusion and increases the active surface, which is effectively reacting with the electrolyte. The nanoscale petal-like electrode material fabricated in this study provides clues to address the problem of energy applications of high-performance alkaline rechargeable batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2020
·
IF 0
Xinyuan Bi,Yuqing Gu,Jian Ye
Single-molecule (SM) detection in surface-enhanced Raman spectroscopy (SERS) demonstrates ultrahigh sensitivity and boosts wide applications. The bianalyte SERS (BiASERS) technique largely improves the accuracy and reliability of SM SERS detection over the monoanalyte approach by avoiding the use of ultralow-concentration samples and induced inaccuracy and very limited events. Herein, dual-type single-nanoparticle (SNP) SERS detection, an adapted version of the bianalyte SM technique, was developed for the first time with two types of ultrabright gap-enhanced resonance Raman tags (GERRTs) with embedded near-infrared resonant fluorescent molecules, showing concentration- and acquisition time-dependent behaviors and the SNP sensitivity in both aqueous and dry states. Additionally, a correlative Raman imaging and scanning electron (RISE) microscopy confirms the SNP events of GERRTs on the substrate. Therefore, we expand the feasible application scenarios of the BiASERS technique from merely SM to SNP detection and more importantly demonstrate the effectiveness of the pure statistical model of BiASERS with the undoubted experimental examinations. Dual-type SNP detection of GERRTs may open new opportunities for development of ultrasensitive nanotags for reliable localized and quantitative detection in biological environments.
研究领域:
纳米生物学
·
生物医学工程
·
光谱学
✓ 已验证
产品关联
DOI
Nanoscale
·
2023
·Vol. 15
·期 37
·15238-15248
·
IF 6.7
Nan Zhang,Gang Li,Zhichao Yu,Zhenguo Tang,Xiaoyan Liu,Congwei Wang,Kaiying Wang
Heterostructure interfacial engineering between photocatalyst and co-catalyst to obtain an optimized electronic structure is a promising approach to improving their performance in the photocatalytic hydrogen evolution reaction (HER). In this work, two-dimensional nanopetal-like ZnIn2S4 (ZIS) with an adequately exposed active (110) edge facet-decorated Ni cluster heterostructure was prepared via chemical bath deposition, followed by photodeposition. In the catalyst preparation, the ZIS microstructure was modulated to sufficiently expose the active sites of the (110) edge for the HER, on which spontaneous interfacial engineering with an additional Ni cluster co-catalyst would be triggered via photodeposition in situ. The hydrogen production rate of the composite photocatalyst was excellent, at up to 26.80 mmol g−1 h−1 under simulated sunlight, which was 15.4 times greater than that of pristine ZIS. The optimized photocatalyst achieved a state-of-the-art apparent quantum yield of 61.68% at a single wavelength of 420 nm. Combined with systematic experimental characterization and density functional theory calculation, it was demonstrated that the separation and migration of charge carriers were significantly enhanced via the Ni cluster-induced interfacial electron redistribution, which contributed to the near-zero Gibbs free energy barrier and favored intermediate (*H) adsorption and desorption behavior, resulting in the superior photocatalytic performance. In summary, this work enables tuning of the interfacial electronic properties via spontaneous photodeposition of metallic cluster co-catalyst on the edge active sites, through which the separation of photogenerated charge carriers and surface redox reactions can be synergistically facilitated.
研究领域:
材料科学
·
化学工程
·
催化
·
纳米技术
·
光化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Peng-Cheng Guan,Qian-Jiao Qi,Yu-Qing Wang,Jia-Sheng Lin,Yue-Jiao Zhang,Jian-Feng Li
Traditional diagnostic methods, such as blood tests, are invasive and time-consuming, while sweat biomarkers offer a rapid physiological assessment. Surface-enhanced Raman spectroscopy (SERS) has garnered significant attention in sweat analysis because of its high sensitivity, label-free nature, and nondestructive properties. However, challenges related to substrate reproducibility and interference from the biological matrix persist with SERS. This study developed a novel ratio-based 3D hydrogel SERS chip, providing a noninvasive solution for real-time monitoring of pH and glucose levels in sweat. Encapsulating the probe molecule (4-MBN) in nanoscale gaps to form gold nanoflower-like nanotags with internal standards and integrating them into an agarose hydrogel to create a 3D flexible SERS substrate significantly enhances the reproducibility and stability of sweat analysis. Gap-Au nanopetals modified with probe molecules are uniformly dispersed throughout the porous hydrogel structure, facilitating the effective detection of the pH and glucose in sweat. The 3D hydrogel SERS chip demonstrates a strong linear relationship in pH and glucose detection, with a pH response range of 5.5–8.0 and a glucose detection range of 0.01–5 mM, with R2 values of 0.9973 and 0.9923, respectively. In actual sweat samples, the maximum error in pH detection accuracy is only 1.13%, with a lower glucose detection limit of 0.25 mM. This study suggests that the ratio-based 3D hydrogel SERS chip provides convenient, reliable, and rapid detection capabilities with substantial application potential for analyzing body fluid pH and glucose.
研究领域:
生物医学工程
·
分析化学
·
纳米技术
·
可穿戴设备
✓ 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）