JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Xuechen Li,Chaojie Shi,Zixuan Feng,Jie He,Rui Zhang,Zhengchun Yang,Peng Pan,Huayi Li,Deqiang Feng,Lingcheng Zheng
The Si nanowires/ZnFe 2 O 4 /Ag composite photocatalyst is prepared by metal-assisted chemical etching and hydrothermal methods . Photoelectric conversion and photodegradation experiments show that the composite structure offers high photocatalytic performance under visible light. The photocurrent density of Si nanowires/ZnFe 2 O 4 /Ag is 1.76 mA/cm 2 , and the Methyl orange photodegradation rate is 19 % within 90 min. Furthermore, the photocatalytic activity of composite photocatalysts was studied under the magnetic field, which further improves the photocatalytic efficiency significantly. Energy band structure studies revealed that the interfacial contact in the Si nanowires/ZnFe 2 O 4 /Ag increases carrier transfer and charge separation, thereby improving photocatalytic performance. It can be seen from the I-V results that the Si nanowires/ZnFe 2 O 4 /Ag has a negative magnetoresistance . Therefore, in the presence of a magnetic field, photogenerated carriers can be more effectively transferred to the electrode surface to participate in the photocatalytic reaction with improved photocatalytic performance.
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ACS Omega
·
2023
·
IF 4.1
Housen Jiang,Qin Xu,Xiaolin Wang,Lin Shi,Xuedong Yang,Jianmin Sun,Xifan Mei
Diabetic foot ulcers with complex healing wounds accompanied by bacterial infection are considered a significant clinical problem which are made worse by the lack of effective treatments. Traditional antibiotics and dressings have failed to address wound infection and healing, and multifunctional combination therapies are attractive for treating chronic wounds. In this study, arginine (Arg) was loaded onto the surface of silver nanoclusters and encapsulated in a hydrogel to achieve antibacterial, anti-inflammatory, angiogenic, and collagen deposition functions through the slow release of Arg combined with silver nanoclusters. In vitro studies indicated that Arg-Ag@H composites inhibited methicillin-resistant Staphylococcus aureus and Escherichia coli by 94 and 97%, respectively. The inhibition of bacterial biofilms reached 85%, and the migration ability of human venous endothelial cells (HUVECs) increased by 50%. In vitro studies showed that Arg-Ag@H composites increased the healing area of wounds by 26% and resulted in a 98% skin wound-healing rate. Safety studies confirmed the excellent biocompatibility of Arg-Ag@H. The results suggest that Arg-Ag@H offers new possibilities for treating chronic diabetic wounds.
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PubMed
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CHEMISTRY OF MATERIALS
·
2023
·
IF 8.6
Wenli Wei,Wenhe Wang,Fengxia Wu,Yu Tian,Guobao Xu,Wenxin Niu
Plasmonic-coupled circular dichroism (PCCD) represents a versatile method to synthesize chiroplasmonic nanoparticles (NPs), which play irreplaceable roles in various fields such as enantioselective sensing, spectroscopies, and chiral catalysis. Nonetheless, two critical challenges are faced in the development of PCCD-based chiroplasmonic NPs: low chiral amplification and poor stability. To circumvent these restrictions, we herein performed a quantitative study of the enhancement and stability of PCCD by the embedment of chiral molecules in discrete Ag NPs. Our study reveals that the high chiral amplification is attributed to the chiral molecules embedded in NPs, rather than those adsorbed on the surface. The embedment of chiral molecules significantly increases the coupling between chiral molecules and Ag NPs, and thus, a record-high chiral amplification of over 4800 times is achieved. Moreover, the CD signals of the Cys-embedded Ag NPs are almost unchanged after 3 months of storage, also benefiting from the embedment strategy. These results will open up new possibilities for designing new PCCD systems with high chiral amplification and superior stability and lay the groundwork for the applications of PCCD-based chiral NPs.
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ChemCatChem
·
2019
·Vol. 11
·期 15
·3490-3504
·
IF 4.495
Shanshan Ding,Mengshu Han,Yuxuan Dai,Shaogui Yang,Danjun Mao,Huan He,Cheng Sun
Graphical Next level silver : The novel plasmonic heterojunction photocatalysts of Ag/AgBr/Bi 4 O 5 Br 2 layered microspheres (AAB-LMs) were successfully synthesized by the in-situ deposition and visible-light photoreduction approach. They performed elevated photocatalytic activities towards the degradation of acid orange II and aniline under visible-light irradiation than Bi-O-Br and Ag/AgBr, which was mainly credited to the surface plasmon resonance (SPR) effect of Ag nanoparticles and the synthetic interaction among Ag, AgBr and Bi 4 O 5 Br 2 The novel photocatalysts of Ag/AgBr/Bi 4 O 5 Br 2 layered microspheres (AAB-LMs) were firstly constructed via the in-situ deposition and visible-light photoreduction approach. Their compositions, structures, morphologies and optical properties were characterized by various techniques. The photocatalytic efficiencies of AAB-LMs-10 were 28 and 3.4 times higher than those of Bi 4 O 5 Br 2 -LMs towards degrading acid orange II and aniline, respectively. The superior photocatalytic behavior of AAB-LMs benefited from efficient separation and transfer of photo-generated charges, which was mainly credited to the surface plasmon resonance effect of Ag nanoparticles and the synthetic interaction among Ag, AgBr and Bi 4 O 5 Br 2 . O 2 − and h + were characterized as the predominant photoactive species in this AAB-LMs-photocatalysis system. Moreover, due to the presence of radical species Br 0 , which was verified by the detection of bromoaniline and dibromoaniline during the photocatalytic degradation process of aniline, Z-scheme mechanism rather than the conventional heterojunction mode was more suitable to explain the enhanced photocatalytic performance of AAB-LMs.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2019
·
IF 2.931
Jian-Jun Li,Dan Qiao,Jing Zhao,Guo-Jun Weng,Jian Zhu,Jun-Wu Zhao
The applications of metallic nanoclusters and nanoparticles in biological sensing have attracted special attention owing to their optical interaction based on fluorescence and surface plasmon resonance (SPR). In this work, we designed a fluorescent nanoprobe for the determination of L -cysteine ( L -Cys) based on fluorescence resonance energy transfer (FRET) from gold‑silver bimetallic nanoclusters (Au-Ag NCs) to gold nanorods (AuNRs). Firstly, the negatively charged Au-Ag NCs protected by bovine serum albumin (BSA) are directly adsorbed on the surface of the positively charged AuNRs through electrostatic interaction , and the FRET effect leads to distinct fluorescence quenching of Au-Ag NCs at 615 nm. The SPR wavelength of AuNRs is dependent on the aspect ratio, so the SPR of AuNRs could be tuned to have a better spectral overlap with fluorescence of Au-Ag NCs, which enhances the fluorescence quenching effect. Because the SH group of L -Cys has an affinity with gold, the addition of L -Cys can result in the release of Au-Ag NCs from the surface of AuNRs via forming Au S bonds. Thus, the introduction of L -Cys could effectively restore the fluorescence emission of the AuNRs/Au-Ag NCs system because of the restraint of FRET effect. Under the optimized conditions, the fluorescence recovery of AuNRs/Au-Ag NCs probe exhibits a linear response to L -Cys concentration ranging from 5 to 100 μM, and the corresponding theoretical detection limit (LOD) is 1.73 μM. Meanwhile, this method displays excellent sensitivity and selectivity for L -Cys over other amino acids , and it has been successfully applied to detect L -Cys in real samples.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2019
·Vol. 33
·期 5
·e4865
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IF 3.259
Chao Duan,Chaoran Liu,Xin Meng,Wanli Lu,Yonghao Ni
In this work, we prepared high-performance and recyclable nanocatalysts that consist of small and well-dispersed silver nanoparticles (Ag NPs) immobilized onto Cu- based metal–organic framework (MOF-199 s) supported by carboxymethylated cellulose fibers (CCFs). The as-prepared green nanohybrid catalysts, namely Ag NPs@ MOF-199 s/CCFs, were characterized using SEM, TEM, XRD and FT-IR techniques. The catalytic performances showed that Ag NPs@ MOF-199 s/CCFs catalysts exhibited a very high catalytic efficiency towards the reduction of 4-nitrophenol to 4-aminophenol. The enhanced catalytic performances are attributed to the improved dispersity, small particles of Ag NPs stabilized by the MOF-199 s, and the porous catalyst structures. The introduction of cellulose fiber further facilitates the reuse and sustainability of the nanohybrid catalysts, showing a stable and high reusability (more than 91% of catalytic activity) even after five runs.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Chunyan Ma,De-Kun Ma,Wenyuan Yu,Wei Chen,Shaoming Huang
Photoelectrochemical (PEC) water splitting that can mimic natural photosynthesis to directly harvest and convert solar energy into clean and sustainable hydrogen energy, has been known as a promising avenue for addressing environmental pollution and energy crisis. Spinel-type CuBi 2 O 4 semiconductor as a promising photocathode material for solar water reduction has attracted much attention because of its many unique advantages. However, PEC activity of pristine CuBi 2 O 4 is far from satisfying because of its poor charge carrier transport and transfer efficiency. Herein we report that Ag + ions and N-doped graphene quantum dots (NGQDs) co-modified CuBi 2 O 4 submicron rods (NGQDs/Ag-CBO SMRs) photocathode can show enhanced PEC activity. Our work demonstrated that one-dimensional structure, Ag + ions doping, and NGQDs loading benefited the separation and transfer of photogenerated carriers and improved light harvesting ability, which were collectively contributed to enhanced PEC activity of NGQDs/Ag-CBO SMRs photocathode. As a result, the photocurrent density achieved on NGQDs/Ag-CBO SMRs photocathode under AM1.5G simulated sunlight at 0.3 V vs. RHE was 8.8, 2.3, 1.8, and 5.9-times larger than those obtained on CBO SMRs, Ag-CBO SMRs, NGQDs/CBO SMRs, and NGQDs/Ag-CBO microspheres (MSs) ones, respectively. The present study provides a new strategy for designing low-cost and highly efficient photocathodes.
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Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 27
·8432-8441
·
IF 6.641
Jing Zhao,Chen Wu,Lipeng Zhai,Xiaofeng Shi,Xin Li,Guojun Weng,Jian Zhu,Jianjun Li,Jun-Wu Zhao
A surface-enhanced Raman scattering (SERS)-based sandwich type immunoassay was developed for the detection of α-fetoprotein (AFP) with high sensitivity, reproducibility and selectivity. In the immunoassay, an antibody immobilized nitrocellulose (NC) membrane was employed to capture AFP and antibody conjugated silica coated gold/silver core–shell nanostars (AuNS@Ag@SiO2) were used as SERS probes. AuNS@Ag was synthesized by the direct deposition of Ag on the AuNS. The Ag shell grew outward from the center towards the tips and adopted a polyhedral shape. The AuNS@Ag nanoparticles were shown to have higher SERS activity than gold nanostars (AuNSs), and their LSPR wavelengths could be finely tuned across a wide spectrum ranging from visible to near-infrared by simply adjusting the Ag shell thickness. The silica coating improved colloidal stability of the nanostructure and provided functionality for antibody conjugation. By using 4-mercaptobenzoic acid (4-MBA) as a Raman reporter molecule, the proposed SERS sensor is able to detect AFP with a low limit of detection (LOD) of 0.72 pg mL−1 and a wide and clinically relevant linear detection range from 3 pg mL−1 to 3 μg mL−1. Hence, this SERS-based immunoassay provides a strategy for the detection of trace AFP and has potential to assist in the monitoring of prognosis for hepatocellular carcinoma (HCC) patients.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Xia Yang,Xin Qi,Guoqiang Ma,Zhaoyang Li,Qian Liu,Sara Khan,Yongjie Zhao,Leilei Zhang,Zhi Geng,Yingna Guo
Z -Scheme Ag/TiO 2 /AgMIL-101(Cr) was prepared by co-doping Ag and TiO 2 with AgMIL-101(Cr) via solvothermal synthesis combined with sol-gel method. Ag and anatase TiO 2 nanoparticles were well dispersed on the surface of AgMIL-101(Cr) with octahedral structure. 5 wt% Ag and 50% TiO 2 co-doping on the AgMIL-101(Cr) (Ag 5 T 50 Ag 5 M) exhibited large specific surface area (346.5 m 2 ·g −1 ) and narrow band gap 2.16 eV. Only 10 min of UV light irradiation resulted in the conversion of nitrate and nitrogen selectivity up to 100% over Ag 5 T 50 Ag 5 M. After 5 cycles of nitrate removal, the conversion of nitrate remained 90% indicating that catalyst had stable reusability. Moreover, instead of formic acid , ofloxacin (OFX) was used as a hole scavenger to evaluate the ability of Ag 5 T 50 Ag 5 M for the nitrate reduction. The result showed that the concentration of OFX was important factor to affect the conversion of nitrate. Based on the above discussion about the characterization and photocatalytic nitrate reduction, combined with the photoluminescence and electrochemical measurement results, the enhanced conversion of nitrate and nitrogen selectivity was reasonably explained. Finally, the route of electron transfer during the three constituents constructed Z -Scheme system and the mechanism of nitrate reduction to nitrogen was presumed.
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Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 23
·7061-7072
·
IF 6.641
Xiangying Meng,Songfang Zhao,Zhe Zhang,Ruliang Zhang,Jinhui Li,Jinfeng Leng,Duxia Cao,Guoping Zhang,Rong Sun
Recently, it has become highly desirable but remains a challenge to design strain-sensing materials with rational geometric structures that endow the strain sensors with high sensitivity, large stretchability and a broad sensing range simultaneously. Herein, core–shell Cu–Ag nanowires (NWs) with tunable morphology and oxidation-resistance are achieved by an effective galvanic replacement reaction between Cu NWs and Ag(NH3)2+ without any additional heating, stirring or reducing agent. When the mass ratio of Cu NWs to AgNO3 is 8 : 6, Cu–Ag NWs exhibit the best oxidation-resistance and electrical conductivity retention in harsh environments. Nacre-mimetic conductive composites are achieved by embedding porous conductive networks composed of Cu–Ag NWs/reduced graphene oxide (rGO) in a poly(styrene-block-butadiene-block-styrene) (SBS) matrix, enabling the process to be simple, energy-saving, and scalable. They can detect both tiny and large deformations with a wide sensing range (up to 374% strain), high sensitivity (a gauge factor up to 87 362), high break elongation (up to 660% strain), and excellent reliability and stability. This successful combination of huge sensing range and high sensitivity is attributed to the high stretchability of the SBS “mortar”, the hierarchical architecture and the synergistic effects of sensitive two-dimensional (2D) rGO, and the conductive stretchable one-dimensional (1D) Cu–Ag NW “brick”. In addition, the composites can be used as patterned conductive interconnects for light-emitting diodes.
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Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 16
·9761-9772
·
IF 10.733
Chengyan Liu,Zhiwei Huang,Dianhui Wang,Xiuxia Wang,Lei Miao,Xiaoyang Wang,Shaohai Wu,Nozomu Toyama,Toru Asaka,Junliang Chen,Eiji Nishibori,Li-Dong Zhao
Recently, thermoelectric lead-free selenides have attracted great attention due to their earth-abundant, low-cost and environment-friendly characteristics. Here we report a new strategy to simultaneously enhance the electronic transport properties and reduce the thermal conductivity of polycrystalline SnSe2. By combining weak van der Waals bonding with the mobile behavior of Ag+ ions, the carrier concentration is optimized over a wide temperature range, which can be attributed to the dynamic Ag+-intercalation into the van der Waals gap from the Ag+ ion reservoir AgSnSe2. On account of additional electrical bridges between interlayers contributed by the intercalated Ag+ ions and weak anisotropy, an exciting high power factor of up to ∼7.46 μW cm−1 K−2 at 789 K is achieved along the pressing direction. In addition, the thermal conductivity is simultaneously reduced to ∼0.57 W m−1 K−1 at 789 K, owing to numerous line defects, phase interfaces, twin boundaries, dislocations and intercalated atomic layers generated after Ag introduction, as well as the anharmonic vibration of Ag+ ions. As a result, a record peak ZT of ∼1.03 at 789 K is realized along the pressing direction, which is ∼1.6 times larger than the highest reported value (0.63) of polycrystalline SnSe2 and even comparable to that of p-type polycrystalline SnSe. This study opens a new way to achieve ultra-high thermoelectric performance, especially in layered materials.
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ANALYTICAL SCIENCES
·
2019
·Vol. 35
·期 7
·733-738
·
IF 1.618
Zhao Rui,Wang Yue,Zhang Zhiqiang,Hasebe Yasushi,Tao Dongping
Molybdenite (MLN) was physically co-adsorbed with Ag nanoparticles (Ag) on a glassy carbon electrode (GCE) for selectively sensing of ascorbic acid (AA). The composite was characterized with a scan electron microscope, a hightemperature confocal laser scanning microscope, an X-ray diffractometer, an X-ray fluorescence analyzer and electrochemical methods. The prepared MLN/Ag-GCE sensor exhibited good properties including a linear range from 3.0 × 10 −5 to 1.0 × 10 −3 M toward AA, a low detection limit of 1.5 × 10 −5 M, good selectivity, excellent reproducibility, and good stability. The synergistic effect between MLN and Ag nanoparticles results in an enhancement of the electrocatalytic activity for molybdenite.
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