OPTICS EXPRESS
·
2024
·Vol. 32
·期 6
·9995-10004
·
IF 3.2
Jiawei Huang,Rui Li,Hengchang Zhang,Ying Wu,Yunxia Wang,Yunxia Wang,Changchun Yan,Changchun Yan,Caiqin Han,Caiqin Han
We present a design of middle-infrared modulation absorbers based on vanadium dioxide (VO2). By using the electron beam evaporation technique, the Ag/SiO2/VO2/Ag/VO2 multilayer structure can achieve double band strong absorption in the mid-infrared, and dynamically adjust the absorption performance through VO2. The simulation results demonstrate a remarkable absorption rate of 91.8% and 98.9% at 9.09 µm and 10.25 µm, respectively. The high absorption is elucidated by analyzing the field strength distribution in each layer. Meanwhile, based on the phase change characteristics of VO2, the absorber has exceptional thermal regulation, with a remarkable 78% heat regulation range in the mid-infrared band. The size altering of the absorbing layer is effective in enhancing and optimizing the structure's absorption performance. The structure is used to characterize probe molecules of CV and R6 G by mid-infrared spectroscopy, which illustrates an impressive limit of detection (LOD) of 10−7 M for both substances. These results provide valuable insights for designing future high-performance tunable optical devices.
研究领域:
光学
·
材料科学
·
光谱学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Yuan Li,Wenyao Qian,Yong Xia,Xinxin Li,Dongmei Li,Zhiqiang Guo
Noble metal nanostructures with localized surface plasmon resonance (LSPR) effect can be employed to enhance the light absorption ability of photocatalysts . However, it has been a challenge to control the size and morphology of noble metal nanostructures to manipulate the LSPR wavelength and improve the performance of photocatalysts. Herein, an Ag dendrite (AgD) composed of Ag nanorods with different sizes was facilely constructed by a displacement reaction, and sunlight-driven LSPR-enhanced core-shell AgD/g-C 3 N 4 composite photocatalysts (AgD-CN) were synthesized by thermal polymerizing mixtures of melamine and different amounts of AgD. This core-shell AgD-CN improved the stability of AgD and made full use of the near-field enhancement effect of AgD’s LSPR, resulting in a broad light absorption band. AgD-CN-15 showed the highest photogenerated electron-hole pair separation rate and the best photocatalytic performance when the addition amount of AgD was 3 wt%. The degradation rate of RhB by AgD-CN-15 reached 95.20% after sunlight irradiation for 60 min, and its reaction rate constant was 5.2 times that of the pristine g-C 3 N 4 . Moreover, ·OH, h + and ·O 2 - were found to be the main active species. AgD is easy to prepare and can broaden the light absorption wavelength range and significantly enhance light absorption ability of photocatalysts, which provides a new method to improve the performance of LSPR-enhanced photocatalysts.
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
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yu Qiu,Zhihao Sun,Zihao Guo,Jingyu Bi,Guangshen Li,Lei Qian
Herein, oxygen-deficient NH 4 V 4 O 10 micro-flowers with loaded Ag quantum dots and pre-intercalated Ag + (NVO-Ag) for aqueous zinc ion battery (AZIB) cathode materials were successfully synthesized by a one-step hydrothermal method. The reversible redox reaction between Ag + and Ag quantum dots, and the abundant Zn 2+ storage sites from oxygen vacancies provided capacity contributions for NVO-Ag. Meanwhile, the loaded Ag quantum dots, pre-intercalated Ag + and introduced oxygen vacancies synergistically optimized the electronic structure and distribution of NVO-Ag, promoting the transport of electrons in NVO-Ag. The pre-intercalated Ag + could also replace the NH 4 + in the interlayer of NH 4 V 4 O 10 , weakening the repulsion between the interlayer NH 4 + and Zn 2+ , which achieved rapid Zn 2+ diffusion kinetics. Moreover, the abundant oxygen vacancies in NVO-Ag could alleviate the strong electrostatic interaction between Zn 2+ and V-O framework, boosting the transmission of Zn 2+ in NVO-Ag. Finally, the structural stability of NH 4 V 4 O 10 micro-flowers was improved due to the high bonding strength between Ag + and V-O layers. Benefiting from the above effects, NVO-Ag-100 achieved excellent capacity performance (387.2 mAh g −1 at 0.5 A g −1 ), rate performance (178.9 mAh g −1 at 12 A g −1 ) and cycle stability (91.7 % capacity retention after 1700 cycles at 8 A g −1 ). This work provided effective ideas to achieve high-performance AZIB cathode materials.
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 Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Xiuting Li,Hongmei Liu,Ying Chen,Chenjie Gu,Guodong Wei,Jun Zhou,Tao Jiang
Pesticides and additives, extensively used in the raw agriculture samples and processed food, have attracted tremendous interests owing to their latent menace to the surroundings and human health. Herein, a rationally designed multifunctional polymethyl methacrylate-silver/graphite-like carbon nitride/silver (PMMA–Ag/g-C3N4/Ag) hybrid substrate with plasmonic-enhanced intrinsic Raman signals was exploited and served as a recyclable and quantitative surface-enhanced Raman scattering (SERS) sensor. Especially, the as-prepared flexible substrate with an electromagnetic enhancement factor of 1.64 × 106 could realize the sensitive monitoring and in-situ degradation of thiabendazole (TBZ) and carmine acid (CA) on apple or in applesauce with limits of detection as low as 2.29 × 10–6 and 6.76 × 10–5 mg/mL. Furthermore, heightened linear correlations with coefficients of 0.996 and 0.997 were accurately acquired using the film peak of PMMA as an internal standard. It was proved that the proposed sophisticated substrate may present attractive superior-in-practice multiplexed quantitative monitoring and facile decomposing of harmful molecules. The resulting recovery values distributed from 60.9 to 126% for the deeply processed foods that were decorated by 10–4 to 1 mg/mL CA together with TBZ.
研究领域:
分析化学
·
环境科学
·
食品安全
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 4
·1623-1628
·
IF 8.867
Binbin Jiang,Yuyang Sun,Fan Liao,Wen Shen,Haiping Lin,Hui Wang,Mingwang Shao
Hydrogen production with the aid of electrocatalysis is a critical component for several developing clean-energy technologies. Such a renewable energy depends heavily on the choice of cheap and efficient catalysts for hydrogen evolution, which has still been a challenge until now. In this work, the theoretical calculation indicates that Rh–Ag–Si ternary catalysts exhibit more active hydrogen evolution performance than Pt–Ag–Si because the migration activation energies of H atoms from Rh(111) to Si are lower than those from Pt(111) to Si via the Ag surface. This simulation was confirmed by the experimental results: Rh–Ag/SiNW (or Pt–Ag/SiNW) catalysts were prepared by directly reducing Rh (or Pt) and Ag ions with Si–H bonds. The Rh–Ag/SiNW-2 with the optimal mass ratio of 2.3 : 23.4 : 74.3 (Rh : Ag : Si) exhibited a lower Tafel slope (51 mV dec−1) and a larger exchange current density (87.1 × 10−6 A cm−2) than the Pt–Ag/SiNW. In addition, the mass activity of Rh–Ag/SiNW-2 at an overpotential of 0.2 V (11.5 mA μgRh−1) is 12.0, 5.0 and 3.3 fold higher than that of Rh–Ag (0.96 mA μgRh−1), Pt–Ag/SiNW (2.3 mA μgPt−1) and 40 wt% Pt/C (3.5 mA μgPt−1) catalysts, respectively. Moreover, the Rh–Ag/SiNW nanocatalysts had good stability in acidic media. The results presented herein may offer a novel and effective methodology for the designing of cost-efficient and environmentally friendly catalysts for electrochemical fields.
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
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Jialin Shi,Lina Zhang,Nannan Sun,Deng Hu,Qun Shen,Fang Mao,Qiang Gao,Wei Wei
Metal–organic frameworks (MOFs) are promising hosts for catalytic active sites due to their adjustable porosity and framework chemistry. Strategies to improve synergistic effects between the installed sites and the parent MOF are highly desired. Herein, a facile and rapid method for the preparation of xAg@ZIF-8 materials was reported. The materials were systematically characterized and used as catalysts for carboxylation of terminal alkynes via direct insertion of CO2 to the C(sp)–H bond (CTACO2). It was found that the integrity of the ZIF-8 structure could be retained upon Ag loading, but short-range crystalline ordering was modified. Two types Ag species could be installed, namely, highly dispersed Ag(I) in the backbone (AgHD) and aggregated Ag(0) nanoparticles on the outer surface (AgNP). The AgNP sites are highly effective for the activation of terminal alkynes due to its high accessibility, while the AgHD-modified ZIF-8 framework worked as a CO2 reservoir with enhanced affinity. Combination of these factors translated to high activity in the CTACO2 process, the measured turnover frequency and time yield are among the highest among most heterogeneous catalysts.
研究领域:
催化
·
材料科学
·
化学工程
·
无机化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2016
·Vol. 26
·期 33
·6025-6032
·
IF 11.382
Yuyang Li,Guanghua Liu,Tengfei Cao,LiMin Liu,Jiangtao Li,Kexin Chen,Laifeng Li,Yemao Han,Min Zhou
Dense bulk samples of (Ag,In)-co-doped Cu 2 SnSe 3 have been prepared by a fast and one-step method of combustion synthesis, and their thermoelectric properties have been investigated from 323 to 823 K. The experimental results show that Ag-doping at Cu site remarkably enhances the Seebeck coefficient, reduces both electrical and thermal conductivities, and finally increases the figure of merit (ZT) value. The ZT of the Cu 1.85 Ag 0.15 SnSe 3 sample reaches 0.80 at 773 K, which is improved by about 70% compared with the unadulterated sample (ZT = 0.46 at 773 K). First principle calculation indicates that Ag-doping changes the electronic structure of Cu 2 SnSe 3 and results in larger effective mass of carriers, thus enhancing the Seebeck coefficient and reducing the electrical conductivity. The low electrical conductivity caused by Ag-doping can be repaired by accompanying In-doping at Sn site, and by (Ag,In)-co-doping the thermoelectric properties are further promoted. The (Ag,In)-co-doped sample of Cu 1.85 Ag 0.15 Sn 0.9 In 0.1 Se 3 shows the maximum ZT of 1.42 at 823 K, which is likely the best result for Cu 2 SnSe 3 -based materials up to now. This work indicates that co-doping may provide an effective solution to optimize the conflicting material properties for increasing ZT.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 19
·9200-9208
·
IF 9.931
Yaozhu Wang,Xueyan Huang,Kaiqiang Wang,Lulu Zhang,Bo Wang,Zhibin Fang,Yan Zhao,Fan Gao,Ping Liu,Wenhui Feng
Ultrathin Bi12O17Cl2 nanosheets, with the thickness of 3–4 nm, were prepared by the photo-assisted Ag exfoliation method. This method not only achieves the thickness regulation, but also introduces elemental silver on the surfaces of ultrathin Bi12O17Cl2 nanosheets. The obtained ultrathin Bi12O17Cl2 nanosheets modified with Ag show enhanced visible light absorption, improved carrier generation and separation efficiency under visible light irradiation. Their photocatalytic performance for rhodamine B (RhB) degradation is 5 times higher than that of bulk Bi12O17Cl2. It is expected that the present synthetic strategy may provide a new design concept for the fabrication of ultrathin structures.
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
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2021
·
IF 4.098
Zichen Yang,Chaoqun Ma,Jiao Gu,Yamin Wu,Chun Zhu,Lei Li,Hui Gao,Wenzhi Yin,Zirui Wang,Ye Zhang,Yunpeng Shang,Chengwei Wang,Guoqing Chen
Benzoic acid, which has a pivotal role in food additive, is prohibited to add as a preservative in dairy products. China, Brazil, and other countries have proposed standard methods to detect the addition of benzoic acid in food. Surface-enhanced Raman scattering (SERS) is an upcoming spectral detection technique, which has been widely used in the field of material analysis with the advantages of non-invasive, fast detection speed and complex environment with little interference. To detect the illegal use of benzoic acid in dairy industry, we developed Ag-COF (covalent-organic framework) material as SERS substrate to detect benzoic acid in liquid milk. The great enhancement ability of Ag-COF substrate is controlled by the addition of acetic acid and complex interplay between COF material and benzoic acid. This detection method has high sensitivity and reliability that allows us to achieve limit of detection (LOD) of 0.13 μg/mL in milk and 0.00372 μg/mL in water by applying this method. In experiment on recovery rate of real samples, the detection time is less than 15 minutes and the relative standard deviation (RSD) ranged from 2.82% to 5.69%. Therefore, this method has practical significance of the detection of benzoic acid in dairy products.
研究领域:
食品科学
·
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Chunxue Wang,Zhao Li,Xin Sun,Yuan Li,Lei Shi,Shunzheng Zhao,Kai Li,Ping Ning,Fei Wang
Ag-based catalysts show high activity in NH 3 -selective catalytic oxidation (NH 3 -SCO). The anchoring states of Ag species determines its valence and dispersion, thereby influencing the performance of Ag-based catalysts. Herein, we elucidated that the content and anchoring strength of the hydroxyl (OH) groups on support together affect the anchoring states of Ag. TiO 2 has few OH groups but high anchoring strength, the anchored Ag is in a highly dispersed oxidized state, while the unanchored Ag is aggregated in a metallic state (Ag 0 ), so it presents an unevenly sized dispersion and mainly in oxidized state. SiO 2 has abundant OH groups but weak anchoring, and can excessively agglomerate into large Ag 0 nanoparticles (Ag 0 NPs). Therefore, the introduction of SiO 2 can regulate the anchoring states of Ag on the TiO 2 support, making Ag presents highly dispersed Ag 0 NPs, thus following a reaction mechanism with lower energy barriers and significantly improving the NH 3 -SCO performance.
研究领域:
催化化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jungang He,Mohan Yuan,Xia Wang,Xiao Chen,Xiang Peng,Liuyong Hu,Xue Zhao,Jing Liu,Jinghui Li,Kanghua Li,Chao Chen,Jiang Tang
Photodetectors with a broad spectral range play significant roles in optoelectronic applications. Introducing impurity atoms with the desired energy levels in semiconductors is an effective way to extend the spectral response range of photodetectors . Here, we demonstrate an extrinsic photodetector by introducing Ag + cations in methylammonium lead bromide (MAPbBr 3 ). The 5 % Ag-doped MAPbBr 3 single crystals exhibit excellent response with a high responsivity up to 0.56 A/W, a high detectivity of 2.22 × 10 10 jones, and a high response speed of 0.30 s/0.12 s under 700 nm wavelength illumination. Moreover, by the detailed investigation of the crystallinity and energy level distribution, we find that the Pb 2+ in MAPbBr 3 crystals is partially substituted by the Ag + impurities, which form the sensitive centers and thus induce the extrinsic response by the photo-carriers transition from the valence band to the sensitive centers. These results extend the spectral response region of perovskite optoelectronic applications and indicate the role of doping impurities with the desired energy level in improving the extrinsic response.
研究领域:
材料科学
·
光学工程
·
半导体物理
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2013
·
IF 3.172
Shaofeng Zhang,Feng Ren,Wei Wu,Juan Zhou,Lingling Sun,Xiangheng Xiao,Changzhong Jiang
Composite photocatalysts that consist of semiconductor and noble metal nanostructures have been considered to be the promising and crucial materials for straightforward improving the efficiency in photocatalytic process and for the conversion of solar to chemical energy. In this work, we fabricated Ag-α-Fe 2 O 3 hybrid composites through a self-catalytic growth method by using the aldehyde-modified spindle α-Fe 2 O 3 nanoparticles (NPs) as supports. The size of supported Ag NPs can be directly controlled on the surface of α-Fe 2 O 3 . The morphology and structure of the resulting Ag-α-Fe 2 O 3 hybrid composites were studied by various techniques, including SEM, TEM, and XRD. The distinct photocatalytic behaviors were examined through the photodegradation of RhB dye. It was found that with the Ag NPs, the photocatalytic activities were enhanced greatly and the size of the Ag NPs played a crucial influence on the photocatalytic behaviors of the Ag-α-Fe 2 O 3 composites.
研究领域:
材料科学
·
光催化
✓ 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）