APPLIED CATALYSIS A-GENERAL
·
2025
·
IF 4.8
Zhenwen Yang,Ziyi Shui,Ben Niu,Xiaoxiao Duan,Zheng Wei,Guoxia Jiang,Zhengping Hao
NH 3 decomposition is receiving increased attention for on-site CO x -free H 2 generation. Unfortunately, the harsh reaction conditions often cause sintering of active metals. Here we report a simple method to achieve well Ni dispersion by nano-structuring the BN support with La species. The surface reaction-induced LaBO 3 nano-islands on BN support have a strong affinity for Ni atoms, which can capture and confine Ni species to yield a large population of well dispersed Ni clusters and nanoparticles. The Ni species selectively anchored on LaBO 3 islands expose more active sites and boost desorption of N 2 and H 2 , exhibiting superior activity and stability for NH 3 decomposition. In addition, it is revealed that the Ni dispersion is sensitive to the change of the support surface structure. These findings highlight the important role of support structure in determining the nature of the metal phase and provide guidance for designing catalysts with controlled catalytic structure and reactivity.
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Jiuxuan Zhang,Hong Jiang,Yefei Liu,Rizhi Chen
ZIF-derived N-doped carbon (CN) materials were modified in this work by TiO 2 nano-islands with oxygen vacancies (O V ) through a sol-gel method and subsequent thermal treatment. By loading Pd nanoparticles (NPs) on CN@TiO 2 , Pd@CN@TiO 2 catalysts were fabricated. Superior catalytic performance of Pd@CN@TiO 2 was found in the selective phenol hydrogenation to cyclohexanone , with a TOF of 30.1 h −1 , 2.2-fold as high as that of Pd@CN. The synergistic effect of CN and TiO 2 nano-islands was responsible for the superior catalytic performance. More O V was generated due to the high specific surface area of CN. At the same time, CN could also enhance the hydrophilicity , and adsorb more phenol in non-planar fashion. The TiO 2 nano-islands with O V could improve the Pd dispersion, make more Pd element on the support surface, strengthen the antioxidizability of Pd and induce electron-rich Pd NPs. Furthermore, the as-fabricated Pd@CN@TiO 2 showed good recyclability in the phenol hydrogenation, and also exhibited excellent catalytic performance in the catalytic hydrogenation of phenol with diverse functional groups. These findings provide the feasibility of using the high-performance catalysts for the hydrogenation of phenol derivatives.
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Jie Shi,Xiaoqing Huang,Jiangtao Xu
Island-shaped Ag nanoparticles are prepared under the support platform of quartz fabric by a simple chemical deposition method. The prepared flexible SERS substrate in this study demonstrates highly sensitive, excellent signal reproducibility and stability. The enhancement ability can be adjusted by varying concentration of Ag + during synthesizing process, which would lead to the variation of size and gaps of Ag nanoparticles , thus affecting the LSPR effect. Moreover, the prepared SERS substrate shows great practical potential in rapid detection of contaminated fruit with different sampling method.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Chinese Physics B
·
2022
·Vol. 31
·期 3
·037803
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IF 1.652
Hongwen Cao,Liting Guo,Zhen Sun,Tifeng Jiao,Mingli Wang
Wheat leaves with natural microstructures as substrates were covered by the silver nanoislands by magnetron to prepare a low-cost, environment-friendly and mass production surface-enhanced fluorescence (SEF) substrate (Ag-WL substrate). The best SEF substrate was selected by repeatly certifying the fluorescence intensity of 10−5 M Rhodamine B (RB) and 10−5 M Rhodamine 6G (R6G) aqueous solutions. The abundant semi-spherical protrusions and flake-like structures on the surface of the Ag-WL substrate produce high-density hot spots, which provides a new and simple idea for the preparation of biomimetic materials. The results of 3D finite-different time-domain (FDTD) simulation show that the nanoisland gap of semi-spherical protrusions and flake-like structures has produced rich hotspots. By adjusting the time of magnetron sputtering, the enhancement factor (EF) was as high as 839 times, relative standard deviation (RSD) reached as low as 10.7%, and the substrate was very stable and repeatable, which shows that Ag-WL substrate is trustworthy. Moreover, semi-spherical protrusions provide stronger surface-enhanced Raman scattering (SERS) effects compared to flake-like structure. What is more surprising is that the detection limit of the substrate for toxic substance crystal violet (CV) is as low as 10−10 M.
研究领域:
材料科学
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生物仿生学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 19
·15577-15584
·
IF 3.289
Haixia Xuan,Xi Chen,Yinghui Wu,Kena Song,Yuenan Li,Ruchuan Liu
The impact of the nanostructures of conjugated polymers on their electronic properties is significant. We notice that poly(3-hexylthiophene-2,5-diyl) (P3HT) can form nano-islands and nano-fibrils, and both of them show an similar single-layer thickness (∼1.5–1.6 nm) as evaluated by atomic force microscopy (AFM). The Raman spectra indicate the highest degree of chain planarity and crystallinity in the nano-islands. By using scanning Kelvin probe microscopy (SKPM) and electrostatic force microscopy (EFM), we image the surface potential at the nanometer scale and quantitatively estimate the charges on these nanostructures as modulated by light. Both results are consistent with each other: the surface potential increases on switching on the light, and the photo-induced charges are around 15–25% and positive. A similar amount of the photo-induced charges in both P3HT islands and fibril is consistent with the π–π stacking nature of these nanostructures. As P3HT is a hole-conducting molecule, positive charges are found easily injected into a single island by a positively biased EFM tip, and then the injected charges are able to propagate all over the island.
研究领域:
材料科学
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物理化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2019
·Vol. 19
·期 2
·691-696
·
IF 1.093
Sheng Tao,Guo Fanglei,Deng Jingzhe,Yuan Yi,Deng Dawei,Xie Zhuoying
In this work, we combine the magnetic microbeads fabricated by microfluidics with nanoplasmonic-assisted fluorescence enhancement for the first time. These bifunctional microbeads not only have high fluorescence enhancement factor but also have magnetic response. The magnetic polymer
microbeads were generated by capillary microfluidic device and then coated uniformly by the gold nano-islands layer. By enhancing the electric field and improving the quantum yield of the fluorescent dye, the fluorescence intensity of Dylight 800 dye has increased about 121 fold. These results
demonstrate that these fluorescence enhancement magnetic microbeads have potential for developing high sensitively automatic detection systems.
研究领域:
生物技术
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Xianghua Gong,Yang Li,Jinzhu Wu,Hongjun Kang,Xiaohong Wu
Recently, zeolites have been selected as a potential adsorbent for capturing space molecular contaminants owing to their strong adsorption ability and extreme stability in a harsh environment. Considering the adsorption process in a vacuum environment, enhancement of the adsorption performance of the zeolites is required. Unfortunately, up to now, the improved adsorption behavior for the space molecular contaminants of the modified zeolite adsorbent under ultralow pressure has rarely been reported. Herein, a 13X/ZnO adsorbent was prepared by incorporating ZnO nanoislands into the nanoporous zeolite 13X via atomic layer deposition (ALD). It is found that a representative 13X/ZnO-50 exhibits an increased adsorption capacity toward dimethyl phthalate and the outgassing species of J133 adhesive even under the ultralow pressure of 10–5 Pa. This could be attributed to the synergistic effects of physical interactions and chemical adsorption associated with the unique cage structure of the zeolite and the incorporated ALD-grown ZnO nanoislands. This work provides a useful strategy for developing the adsorbents used in space molecular contamination control during space missions.
研究领域:
材料科学
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航天工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Fundamental Research
·
2024
·
IF 5.7
Haoyang Fu,Qingze Chen,Benzhi Min,Shuzhou Li,Xiaodong Chen,Lan Ling
Probing the molecular-level redox behavior and mechanism of oxides is essential to developing innovative applications in different fields such as catalysis, but remains a challenge for the scientific community. Using in-situ transmission electron microscopy, here we provide an overall reduction view of single-crystalline α-Fe 2 O 3 with different characteristics from the conventional wisdom of oxide reduction. Specifically, the formation of epitaxial nanoislands with concomitant oscillatory phase transitions (α-Fe 2 O 3 →defective γ-Fe 2 O 3 →α-Fe 2 O 3 ) at the subsurface is observed during reduction. The dynamic equilibrium of lattice oxygen at the surface and the limited oxygen replenishment from the deep layer drive the α-Fe 2 O 3 →defective γ-Fe 2 O 3 transformation in the subsurface, while the polymorphic transition (defective γ-Fe 2 O 3 →α-Fe 2 O 3 ) spontaneously occurs under heating conditions. Such oscillatory phase transition is accompanied by the release of asymmetric stress, inducing the extension of epitaxial nanoislands. Our work highlights the complexity of reduction by providing an integral picture of oxide reduction, which contributes to the understanding of the site evolution of oxide-based catalysts in their working state.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Kai Zhao,Zhumin Yu,Hao Zhou,Lei Chen,Shuoran Chen,Bo Liu,Changqing Ye
Plasmonic nanostructures provide unique structural coloration features via resonant interactions with light, rendering them useful in various optical applications. Here, new types of novel plasmonic-photonic Janus (PPJ) films are developed by introducing aluminum nanoislands on the surface of colloidal photonic crystal (CPC) arrays. Notably, the obtained PPJ films show vivid and tunable plasmonic colors ranging from purple to golden that can be regulated by the sizes of nanoisland architectures. Exquisite multicolored patterns on PPJ films have also been successfully achieved via regioselective deposition, showcasing enormous potentials in decorations. More intriguingly, by virtue of the sensitivity of Al nanoislands to the medium, the PPJ films display superior colorimetric detection ability in response to different solvents and biomolecule glucose. Leveraging these merits, advanced rewritable papers and reliable express waybills have been demonstrated based on PPJ films, offering abilities to deliver information reversibly and erase them on-demand. This work establishes a new platform for achieving versatile applications within a single plasmonic system, opening up vast possibilities for advancements in information delivery and personal information security.
研究领域:
光学
·
材料科学
·
生物医学检测
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 73
·44719-44727
·
IF 3.119
Jinghao Lu,Libin Yang,Wei Guo,Songtao Xiao,Lingyu Wang,Yinggen OuYang,Peng Gao
With the rapid development of fuel cell technology, the low reduction rate of oxygen on Pt-based cathodes is generally considered the main obstacle. Pt/transition metal alloys (Pt–Ms) or Pt/transition metal oxides (Pt–MOx) can be formed by doping transition metal atoms into the lattice of the Pt layer or depositing onto the surface of the Pt layer to intensify the catalytic activity of the electrodes. In this work, a stepwise solution chemical reduction method for high dispersion of cobalt oxyhydroxide (–OCoOH) deposited onto the facet of Pt as nano-islands and the mechanism of promoting the oxygen reduction reaction (ORR) at the cathode have been investigated by density functional theory (DFT) calculation. As a result, the electrocatalytic activity of Pt with nano-island –OCoOH structure was 3.6 times that of the Pt/C catalyst, which indicated that promoting the desorption of the first O atom and weakening the adsorption capacity of the interfacial junction Pt for the second O atom from adsorbed oxygen attributed to the migration of d-band center in Pt and the existence of the Co hydroxyl group.
研究领域:
材料科学
·
电化学
·
催化作用
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED OPTICS
·
2017
·Vol. 56
·期 20
·5751-5760
·
IF 1.65
Jiamin Quan,Yong Zhu,Jie Zhang,Junyin Li,Ning Wang
We report an effective and simple method to further enhance the surface-enhanced Raman scattering (SERS) by silver (Ag) nanoparticles (AgNPs) self-assembling into the nanogaps of an Ag nanoisland (AgNIs). The AgNIs prepared by dewetting of Ag film created a nanorough surface, which induced the Ag nanoparticles to regularly deposit into the nanogaps. AgNPs and AgNIs samples were also prepared for comparative analysis. Their SERS activities were investigated theoretically and experimentally. Experimental enhancement factors (EFs) for AgNPs, AgNIs, and AgNPs decorated AgNIs substrate (AgNPs-AgNIs) were ∼107, ∼106, ∼108, respectively, with relative standard deviation (RSD) of 66.1%, 12.9%, and 13.2%. Remarkable enhancement (EF≈108) and excellent reproducibility (RSD=13.2%) indicated the AgNPs-AgNIs had a high potential in practical application. Electromagnetic simulation using COMSOL Multiphysics demonstrated that the additional enhancement of the SERS effect could be mainly attributed to the improvement of the local electromagnetic field. Moreover, the deposition process of Ag nanoparticles was analyzed in detail to understand the reproducibility of AgNPs-AgNIs.
研究领域:
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
ACS Sensors
·
2020
·
IF 7.333
Yuqi Song,Zhiyuan Ma,Huichao Fang,Qiong Zhang,Qinghai Zhou,Zhihong Chen,Haifeng Yang,Feng Wang
Surface-enhanced Raman scattering (SERS) is a powerful technique for sensitive detection, but it normally has difficulty in multicomponent detection in a complex system, especially for simultaneous analysis of mixture of heavy metal ions. In this work, a simple paper chromatography tandem SERS (PC-SERS) separation/detection platform is proposed by ion-sputtering gold on a filter paper. Based on SEM results, the great electromagnetic field inside nanogaps of Au nanoislands on the paper surface is evaluated with FDTD simulation. It is found that the PC-SERS platform has good uniformity (RSD = 10.12%) and long-time stability. The as-prepared PC-SERS platform was applied to efficiently separate and detect a mixture of pesticides (MG, MB, and CV) in pond water without any pretreatment process, and the limits of detection (LODs) were down to 10 nM. As a crucial application for food safety, several heavy metal ions such as Cd2+, Cu2+, and Ni2+ in grinded rice were successfully detected by the PC-SERS method taking advantage of the sandwich structure based on 4-mercaptobenzoic acid (4-MBA) molecules, which were modified onto sputtering the Au filter paper and gold nanoparticles (Au NPs) to link metal ions and acted as Raman signal molecules. All the LODs for metal ions were down to 1 μM. Due to the easiness of fabrication, good reproducibility, and simple pretreatment step, the PC-SERS platform holds promise in multicomponent detection in a real sample.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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