JOURNAL OF RAMAN SPECTROSCOPY
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2024
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IF 2.4
Huan Wang,Zhengang Wu,Yingna Wei,Ying Chen,Xiao jie An,Jingwu Li,Zhiwu Wang,Yankun Liu,Hengyong Wei
Gastric cancer (GC) is a highly lethal malignancy, seriously threatening people's physical health. Accurate screening of gastric cancer could improve the survival rate of patients. Therefore, exploring noninvasive and efficient cancer screening methods for gastric cancer is of great significance. In the past few years, exosomes have received much attention for their potential in disease diagnosis and treatment. Here, the aim of this study was to explore the detection of serum exosomes via surface-enhanced Raman spectroscopy (SERS) technique based on TiN-Ag@Ag sol composite substrate, and its potential application in gastric cancer diagnosis is evaluated. Exosomes were extracted from the serum of 31 GC patients and 31 healthy controls (HC) using an exosome kit. This study used various machine learning algorithms such as principal component analysis linear discriminant analysis (PCA-LDA), partial least squares discriminant analysis (PLS-DA), support vector machine (SVM), and k-nearest neighbor (KNN) algorithm to analyze SERS spectra, in order to distinguish between HC and GC. The results show that the k-nearest neighbor algorithm performs the best in HC and GC classification. These results indicate that the combination of SERS and machine learning methods provides a new technological approach for gastric cancer screening. This study offers a new proposal for the universal applicability of analysis and identification with SERS of serum exosomes samples in clinical diagnosis.
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Inorganic Chemistry Frontiers
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2024
·Vol. 11
·期 14
·4288-4296
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IF 6.1
Jin Ji,Zijie Chen,Tingting Jiang,Yuhua Feng,Hongyu Chen
A two-dimensional active surface growth was observed for Ag nanoplates under strong ligand control. Distinctively different from the conventional growth modes, the Ag nanoplates showed random shapes despite their flat top and bottom (111) facets. Hence, there is a combination of facet control, judging from the flat nanoplates, with the active surface growth mode, judging from the highly variable side facets with unmistakable signs of inequivalent growth for the initially equivalent side facets. The formation of the segmented Ag nanoplate and the appearance of a “tail” at the end of the nanostructure indicate multiple levels of symmetry breaking and gradually focused growth at each step, likely a result of the dynamic interplay between ligand adsorption and materials deposition. We believe that this partial active surface growth with facet control provides a new strategy for colloidal nanosynthesis, opening possibilities for future synthetic designs.
研究领域:
材料科学
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纳米技术
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化学
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Materials Research Express
·
2018
·Vol. 5
·期 12
·125604
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IF 1.151
Le Li,Minqiang Wang,Jun Guo,Minghui Cao,Hengwei Qiu,Zhi Yang
Ag/Graphene hybrids have become a popular research topic given their enhanced electronic, optical, mechanical, and electrochemical properties. Here, we present a simple and environmentally friendly approach for the synthesis of Ag/Graphene hybrids. Our approach employs graphite foil as the electrode and achieves electrochemical exfoliation under the power of alternating currents. AgNO3 acts as an Ag source, and regulates the generation of free radicals, such as HO·, thus controlling exfoliation, during the formation of Ag/Graphene hybrids. We systematically studied the process parameters that affect the Ag/Graphene hybrids structure, including the addition rate of AgNO3, the agitation rate of the electrolyte, and the temperature of the electrochemical exfoliation process. The as-prepared Ag/Graphene hybrids show excellent electromagnetic interference shielding effectiveness with an optimal value of up to 29.9 dB and with a smaller thickness of 0.257 mm under microwave frequencies of 8.0–12.0 GHz. Our method for the large-scale synthesis of Ag/Graphene hybrids method can be extended to the synthesis of other novel metal/graphene composite and provides an efficient approach for the hybridization of novel metals with graphene.
研究领域:
材料科学
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电化学
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纳米技术
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ADVANCED FUNCTIONAL MATERIALS
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2023
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IF 19
Acan Liu,Xiaodong Li,Wenxiao Zhang,Hui Yang,Xuemin Guo,Chunyan Lu,Haobo Yuan,Wei Ou-Yang,Junfeng Fang
Ag electrode is widely used in inverted perovskite solar cells (PSCs), but its easy reaction and corrosive nature with perovskite always induces severe stability issue. Here, from typical theory of metal anticorrosion, a chemical anticorrosion approach for Ag electrode in inverted PSCs through introducing 2-mercaptobenzothiazole (MBT) as a corrosion inhibitor is reported. MBT can strongly bond to Ag and form a compact [MBT-Ag] chain on Ag surface owing to its N atom in thiazolyl ring and exocyclic thiol groups. As a result, Ag anticorrosion ability is greatly enhanced by increasing the corrosion potential and decreasing the corrosion current, thus effectively inhibiting possible chemical reaction and corrosion between perovskite and Ag electrodes. PSCs containing MBT/Ag exhibit high efficiency of over 23% with good stability, retaining 95 ± 4.1% of initial efficiency after storage for 3800 h in glovebox. Importantly, resulting PSCs also show excellent thermal stability, maintaining 90 ± 1.8% of initial efficiency after aging for 900 h at 85 °C.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2023
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IF 6.9
Jie Yu,Yuwei Wang,Cong Qi,Wenjie Zhang
To improve the utilization efficiency of solar energy, Ag@Fe 3 O 4 core-shell nanoparticles with strong light absorption capacity were prepared, and showed good photothermal and photoelectric properties . Synergistic effects of nanoparticle concentration, light intensity and metal foam on photothermal and photoelectric properties were studied. The results showed that the SPR effect of nanoparticles improves the light absorption ability. Compared with deionized water , the addition of nanoparticles can increase the temperature by 6.10% and the power generation efficiency by 18.75%. When the concentration exceeds a certain range, the increase in concentration no longer plays a positive role. The increase of light intensity can increase the voltage and output power by up to 45.28% and 44.78%. However, it will increase the temperature gradient between the surface and the bottom of the nanofluids , increase the heat loss, and lead to a decrease in power generation efficiency . The synergistic effect of nanoparticles and metal foam can better improve the photothermal performance. The addition of metal foam can increase the power generation efficiency by 5.65%.
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COLLOIDS AND SURFACES B-BIOINTERFACES
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2018
·
IF 3.997
Linhai Biao,Shengnan Tan,Xuewei Zhang,Jing Gao,Zhiguo Liu,Yujie Fu
Preparation of Ag nanoparticles with high antibacterial activities and low adverse effects is urgently needed to apply to the medical and consumer products. In this study, a facile, one-step hydrothermal method has been developed to synthesize proanthocyanidins-functionalized Ag nanoparticles in aqueous solution. UV absorption spectra measurement indicated that the obtained Ag nanomaterials are mainly spherical in shape. FTIR results implied that the poly flavonoids moiety of proanthocyanidins have specific interactions with the surface of Ag nanoparticles. HR-TEM and XRD determination revealed that the Ag nanoparticles had a shell-core structure and the Ag core possessed a highly crystalline structure. Antibacterial tests demonstrated that the proanthocyanidins-functionalized-Ag nanoparticles have high bactericidal efficiency against both bacterial and fungus. Further taking into account their excellent stability, the proanthocyanidins-functionalized Ag nanoparticles in present study have the potential to be applied to the products required for the long-acting antibacterial action.
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PubMed
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Micro & Nano Letters
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2017
·Vol. 12
·期 9
·595-598
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IF 0.723
Xinxin Gan,Feng Xue,Enyong Ding
A simple chemical edge doping method to prepare the Ag nanoparticles/graphite nanosheets (Ag/GNS) composite is presented. The GNS were fabricated in water with the assistance of a high pressure homogenisation (HPH). Ag nanoparticles (Ag-NPs) were decorated on GNS by edge doping. HPH was proved to be an efficient way to fabricate GNS with active sites to anchor metal nanoparticles in the authors’ work. The Ag/GNS composite synthesised by edge doping barely had any defects. The average diameter of the Ag-NPs in this case was 52.6 nm. It was observed that the fabricated Ag-NPs distributed mainly on the edge of GNS where the active sites were. The Ag/GNS composite exhibited a distinct surface-enhanced Raman scattering effect with a low concentration of silver. The Ag-NPs on the composite had improved stability (up to a month). It is believed that this simple and green method of nanocomposite preparation will shed some lights on the large-scale production of metal-nanoparticles-decorated carbon matrices.
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ELECTROCHEMISTRY COMMUNICATIONS
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2021
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IF 4.724
Xiaobo Yang,Xili Tong,Xingchen Liu,Kaixi Li,Nianjun Yang
The performance of a direct methanol fuel cell (DMFC) is strongly dependent on the catalytic anode. A high-performance anode is expected to offer enhanced intrinsic activity and/or a large electrochemical surface area. Herein, a series of Ag-core/Pd-shell (Ag@Pd x , x = 1,3,5) catalysts are synthesized in which the thickness of the Pd shell is varied. Both tensional strain and electron transfer between the Ag core and the Pd shell are found to affect the intrinsic activity of these Ag@Pd x catalysts. Of these, the Ag@Pd 3 catalyst exhibits the best performance for the methanol oxidation reaction (MOR), showing 4.1 times higher mass activity and 2.6 times higher specific activity than a Pd/C catalyst. Furthermore, density functional theory calculations show that this high MOR performance stems from a stronger adsorption of CH 3 OH and OH on the Pd active sites. This catalyst is thus a promising candidate for inclusion in a high-performance DMFC.
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Plasmonics
·
2020
·Vol. 15
·期 6
·2061-2069
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IF 2.335
Xu Runxiang,Yan Luting,Zhu Yanyun,Yin Lan,Song Xiaodong
Triangular Ag nanoplates have been synthesized via the seed-mediated method, which has good morphology and can be reproduced stably. The wavelength of local surface plasmon resonance (LSPR) can be easily controlled in the range of 500–900 nm. When triangular Ag nanoplates were applied to surface-enhanced Raman scattering (SERS) based on suspension aggregates and solid aggregates, the detection limit of rhodamine 6G (R6G) were greatly increased to 3.125 × 10 −7 M and 10 −11 M, respectively, and there was an excellent linear relationship between the intensity of Raman peak and the concentration of R6G. In addition, when the excitation light was tuned to the LSPR wavelength, the surface plasmon resonance will be excited to the maximum extent, and the enhanced electromagnetic field will maximize the Raman scattering. Furthermore, some progress has been made in the optimization of SERS by compounding graphene hydrogels in solid aggregates and adding mercapto polyethylene glycol in suspension aggregates.
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APPLIED SURFACE SCIENCE
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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.
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EUROPEAN POLYMER JOURNAL
·
2013
·
IF 2.562
Qinhui Chen,Longhui Zheng,Baoling Chen,Jinhuo Lin
Janus particles possess heterogeneous surface chemistries which can potentially enhance their interfacial activity and be exploited as useful catalysis agent. It is challenging to control the geometry of the Janus particles and to produce Janus particles in large quantities. In this report, we use a general approach of emulsion swelling assisted protrusion to synthesize the Janus composite particles of titania – poly (vinylbenzyl chloride-divinylbenzene) (TiO 2 -poly (VBC–DVB)). The size of the lobe of poly (VBC–DVB) is tunable. After a series of reactions, including Kornblum oxidation reaction and Tollens’ reaction, the target product of TiO 2 –Ag Janus composite particles is obtained.
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INDUSTRIAL CROPS AND PRODUCTS
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2024
·
IF 5.6
Yuhe Wei,Xiaoping Sun,Yanfen Sun,Juan Yuan,Haoqiu Chen,Lianxin Luo
Self-powered flexible electronic devices are being rapidly developed rapidly for the field of sensing and motion monitoring, posing greater challenges to friction electrical materials. Triboelectric hydrogels must be enhanced in terms of their electrical conductivity and mechanical strength to address the poor stability, low sensitivity, and susceptibility to unpredictable physical damage of conventional hydrogels. In this study, multinetwork polyacrylamide (PAM)-agar (AG)/nanofibrillar cellulose (CNF)-MXene triboelectric hydrogels with homogeneous structures were prepared. By adopting AG and CNF as "sacrificial bonding" modes and utilizing the high conductivity of MXene , triboelectric hydrogels were found to have good electrical conductivity, high tensile properties , high tensile strength , and high sensitivity. Single-electrode triboelectric nanogenerators made of triboelectric hydrogels were used as self-powered wearable sensors for accurately detecting the amplitude of movement in different parts of the human body during exercise. The results obtained in this study have positive implications for promoting the design of high-performance hydrogel materials and their application in flexible wearable sensors.
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