COLLOIDS AND SURFACES B-BIOINTERFACES
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2022
·
IF 5.999
Dongdong Li,Jing Zhao,Jun Ma,Huiquan Yang,Xiaodong Zhang,Yuyu Cao,Peidang Liu
Radiotherapy is one of the main treatment modalities for glioma, but the therapeutic efficacy is often limited by the radioresistance of tumor cells. The radiosensitization effects of silver nanoparticles (AgNPs) and gold nanoparticles (AuNPs) on tumors have been confirmed by previous studies. To enhance the specific killing effect of irradiation on tumor cells, targeted modification of radiosensitizers is urgently needed. Herein, we developed polyethylene glycol (PEG)-coated [email protected] core-shell nanoparticles (PSGNPs) modified with GMT8 aptamer (GSGNPs) and evaluated their radiosensitization effects on glioma cells through in vivo and in vitro experiments. Transmission electron microscope image showed that the prepared PSGNPs had a spherical core-shell structure with an average size of 11 nm. The ultraviolet-visible absorption spectra and Fourier transform infrared spectra displayed that GMT8 was successfully conjugated to PSGNPs. The results of dark-field imaging revealed that the targeting ability of GSGNPs to U87 glioma cells was much better than that to normal human microvascular endothelial cells. Additionally, it was also found that the endocytic pathways of GSGNPs mainly involved clathrin-mediated endocytosis and macropinocytosis . The sensitization enhancement ratio of GSGNPs was calculated to be 1.62, which was higher than that of PSGNPs. In vivo imaging results showed that GSGNPs exhibited good tumor targeting and retention capabilities, and the fluorescence intensity ratio of Cy5-GSGNPs to Cy5-PSGNPs reached a peak at 4 h after injection. More importantly, the median survival time of mice bearing U87 glioma was significantly prolonged after intravenous administration of GSGNPs combined with radiotherapy. This work demonstrated that GSGNPs could be used as an effective nano-radiosensitizer for targeted radiotherapy of glioma.
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高影响因子
Journal of Environmental Chemical Engineering
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2022
·
IF 7.968
Haiyang Fan,Guiyun Yi,Zhengting Zhang,Xiuxiu Zhang,Peng Li,Chuanxiang Zhang,Lunjian Chen,Yulong Zhang,Qi Sun
Herein, we successfully fabricated the Ag deposited BiVO 4 (ABVO) electrode via the combination of electrodeposition and photodeposition for efficient photoelectrocatalytic degradation of β-naphthol under visible-light illumination (λ > 420 nm). The photocurrent density of ABVO photoanode was around 1.6 times higher than that of BiVO 4 (BVO) under visible-light irradiation at 1.5 V vs. Ag/AgCl, which was ascribed to the reduced recombination rate of photoinduced electron-hole pairs, as confirmed by electrochemical impedance spectroscopy (EIS) and Mott-Schottky plots. Additionally, the photoelectrocatalytic (PEC) degradation rate of β-naphthol (10 mg L −1 , 300 mL) by ABVO could approximately reach 80%, whose corresponding kinetic constant was 1.56 times higher than BVO. Based on the radical quenching experiments and EPR results, the •OH and •O 2 - radicals played crucial roles in PEC degradation of β-naphthol. The enhanced PEC performance of ABVO can be ascribed to the synergy of photocatalysis , electrocatalysis and the localized surface plasmon resonance (LSPR) effect of deposited Ag particles, which can effectively suppress the recombination of photoinduced electron-hole pairs, thereby prolonging the photo-excited charges lifespans and promoting the PEC performance. Furthermore, the ABVO photoanode possesses excellent recyclability , outstanding stability and strong resistance to acid and alkali, which can be a promising candidate for PEC organic contaminants degradation.
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高影响因子
CELLULOSE
·
2022
·Vol. 29
·期 4
·2525-2537
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IF 6.123
Liang Chunliu,Zang Limin,Shi Fangfang,Yang Chao,Qiu Jianhui,Liu Qifan,Chen Zhenming
Cotton fabric (CF) fabricated by natural cellulose fibers has porous structure, abundant hydrophilic hydroxyl groups and good mechanical flexibility, which is a promising substrate for flexible fabric-based supercapacitors. Graphene oxide (GO) nanosheets were fixed on the CF by vacuum filtration, and then the pyrrole monomers and silver ions (Ag + ) were adsorbed to the surface of GO/CF by π-π and electrostatic interactions, respectively. Polypyrrole/silver (PPy/Ag) nanoparticles were generated on the surface of GO/CF via in situ UV-induced polymerization, forming the flexible PPy/Ag/GO/CF electrodes. The electrodes combine three active materials (PPy, Ag and GO), which show good electrochemical performance. The electrode prepared under optimum conditions (UV irradiation time: 120 min; mass loading of GO on the CF: 3 mg cm −2 ) exhibits a high specific capacitance of 1664.0 mF cm −2 . The flexible symmetric quasi-solid-state fabric-based supercapacitor (QFSC) based on the optimum electrode also keeps superior electrochemical performance and excellent mechanical flexibility, which has a great application prospect for wearable energy storage devices.
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高影响因子
ACS Applied Energy Materials
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2022
·
IF 6.959
Qian Lin,Yafei Hou,Yaqian Zheng,Yina Tan,Peng Du,Laihui Luo,Weiping Li
To fabricate the polymer-based nanocomposites with excellent energy storage performances for high-temperature applications, hierarchical x wt % Ag@Al2O3 nanofibers (Ag@AO NFs) are designed and prepared, where various Ag nanoparticles (x wt %) are filled into the Al2O3 nanofibers. By adjusting the weight fraction of Ag nanoparticles, the coupling effects of interfacial polarizations and interfacial barrier at Ag/AO interfaces are explored and optimized; excellent energy storage performance was obtained in the 0.50 wt % Ag@AO/PEI nanocomposite. Owing to the high insulation and high thermal conductivity of Al2O3 nanofibers, a stable energy storage performance is realized within 25–150 °C. For example, the 0.50 wt % Ag@AO/PEI nanocomposite delivers an excellent discharge energy density of 6.1 J/cm3 with charge–discharge efficiency of 89.2% at 413.4 MV/m, which is twice as large as that of the pure PEI (3.0 J/cm3 at 382.4 MV/m, 74.6%). This structural design might provide a feasible solution for realizing enhanced energy storage performance at low filler fraction for high-temperature application.
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高影响因子
NANOTECHNOLOGY
·
2022
·Vol. 33
·期 24
·245601
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IF 3.953
Guangming Xu,Xilong Shen,Lei Zhang,Jie Tang,Chuan He,Ziqiang Zhou,Tian Xu,Meifeng Xu,Yonglong Jin,Chaonan Wang
In this study, we developed a flexible and transparent silver/polystyrene/polydimethylsiloxane (Ag/PS/PDMS) substrate with both high density of hot spots and satisfactory uniformity using a cost-effective approach. Via template-guided self-assembly, PS beads were arranged regularly in nanobowls of a square array on PDMS, whose surface structure was transferred from a commercial complementary metal oxide semiconductor chip. Roughness was introduced onto the PS bead surface by nitrogen plasma treatment, followed by sputtering of Ag which generated many hot spots. Differential roughness on the PS bead surface greatly influenced the morphology of the Ag/PS/PDMS substrate. A meat-ball like surface structure was formed with a plasma etching time of 5 min, whose growth mechanism was proposed based on the scanning electron microscope analysis. The high sensitivity and desirable uniformity of the meat-ball like Ag/PS/PDMS substrate were demonstrated by using crystal violet as a Raman reporter, exhibiting an enhancement factor of 2.7 × 107 and a relative standard deviation of 5.04%. Thiram of a lower concentration than the maximum residue limit on the cucumber surface could easily be detected in situ by the proposed substrate, demonstrating its great potential for in-situ food safety analysis.
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高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 7
·1063
·
IF 5.719
Guannan Yang,Shaogen Luo,Tao Lai,Haiqi Lai,Bo Luo,Zebo Li,Yu Zhang,Chengqiang Cui
In this work, we developed an eco-friendly and facile microvia filling method by using printing and sintering of Cu-Ag core-shell nano-microparticles (Cu@Ag NMPs). Through a chemical reduction reaction in a modified silver ammonia solution with L-His complexing agent, Cu@Ag NMPs with compact and uniform Ag shells, excellent sphericity and oxidation resistance were synthesized. The as-synthesized Cu@Ag NMPs show superior microvia filling properties to Cu nanoparticles (NPs), Ag NPs, and Cu NMPs. By developing a dense refill method, the porosity of the sintered particles within the microvias was significantly reduced from ~30% to ~10%, and the electrical conductivity is increased about twenty-fold. Combing the Cu@Ag NMPs and the dense refill method, the microvias could obtain resistivities as low as 7.0 and 6.3 μΩ·cm under the sintering temperatures of 220 °C and 260 °C, respectively. The material and method in this study possess great potentials in advanced electronic applications.Keywords:Cu-Ag core-shell nano-microparticles;microvias;vertical interconnection;blind hole filling;sintering
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Chuankun Yin,Aimal Khan,Qiaohui Gao,Quan Li,Xiaoyun Zhou,Xiuying Liu,Aihua Xu,Xiaoxia Li
Recently, the development of efficient mixed metal oxide catalysts for organic pollutants degradation via peroxymonosulfate (PMS) activation is a hot topic in the area of wastewater treatment . In this work, the silver-copper mixed-oxide, Ag 2 Cu 2 O 3 (ACO) was reported for the first time as a highly active catalyst for removing organic pollutants in the presence of PMS. ACO was successfully synthesized from Ag + and Cu 2+ ions at 60 °C, and its structure was strongly influenced by the temperature. The catalyst could almost completely remove p -nitrophenol and other pollutants with 0.65 mM PMS after 20 min, and also exhibited satisfactory stability and recyclability. The system efficiency was shown to vary with the concentration of PMS and catalyst, as well as solution pH. Scavenger experiment and EPR analysis indicated that radicals produced by the oxidation of Ag(I) and Cu(I) with PMS could promote degradation reaction. The synergistic effect between Cu and Ag in the bimetallic catalyst was demonstrated to contribute to the high performance: Cu(II)-O-Ag(I) bonds promote the conversion of Cu(II) species to Cu(I) through reaction with PMS, and facilitate the oxidation of Cu(I) and Ag(I) by PMS to generate active radicals. The study provides a feasible strategy to design efficient and stable bimetal oxide catalysts for PMS activation.
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高影响因子
OPTICS EXPRESS
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2022
·Vol. 30
·期 21
·38613-38629
·
IF 3.833
Wenzhi Yuan,Yanjun Wu,Zhibin Zhang,Guochao Shi,Wei Han,Kuihua Li,Jungai Gu,Congzhe Chen,Jialin Ge,Wenying Zhou,Jiahao Cui,Mingli Wang,Mingli Wang
The combination of new noble metal nanomaterials and surface enhanced Raman scattering (SERS) technology has become a new strategy to solve the problem of low sensitivity in the detection of traditional Chinese medicine. In this work, taking natural cicada wing (C.w.) as a template, by optimizing the magnetron sputtering experimental parameters for the growth of Ag nanoparticles (NPs) on vanadium-titanium (V-Ti) nanorods, the nanogaps between the nanorods were effectively regulated and the Raman signal intensity of the Ag15/V-Ti20/C.w. substrate was improved. The proposed homogeneous nanostructure exhibited high SERS activity through the synergistic effect of the electromagnetic enhancement mechanism at the nanogaps between the Ag NPs modified V-Ti nanorods. The analytical enhancement factor (AEF) value was as high as 1.819 × 108, and the limit of detection (LOD) was 1 × 10−11 M for R6G. The large-scale distribution of regular electromagnetic enhancement “hot spots” ensured the good reproducibility with the relative standard deviation (RSD) value less than 7.31%. More importantly, the active compound of Artemisinin corresponded the pharmacological effect of Artemisia annua was screened out by SERS technology, and achieved a LOD of 0.01 mg/l. This reliable preparation technology was practically applicable to produce SERS-active substrates in detection of pharmacodynamic substance in traditional Chinese medicine.
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高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Shiyue Wu,Qinglei Jia,Yi Wang,Feng Liu,Gongguo Zhang,Haifeng Zhang,Haiwen Zhang,Maochang Liu,Yiqun Zheng
Plasmonic semiconductor nanomaterials have been widely accepted as promising candidates for photothermal conversion, while the efficiency is yet to optimize. Herein, we report a facile synthesis of Au@Cu x O mesoporous nanospheres anchored with branched Ag nano-islands on the surface and explore their applications as photothermal conversion agent. Due to the intimate hybridization of two materials, the Au@Cu x O-Ag hybrid nanocomposites display a unique dual-plasmonic absorption that covers the visible-NIR range, benefiting the utilization efficiency of light energy . The synthesis is realized by reacting Au@Cu x O with Ag + , the galvanic replacement reaction between them enables a preferential depletion of Cu phase, leaving Ag and Cu 2 O as dominate crystal phases. The resulting hybrid nanocomposites are featured with a core-shell structure but incomplete coverage, as well as the mesoporous interior and dendritic outer shell. In addition to the enhanced photothermal conversion efficiency, the current nano-hybrids show excellent structural stability and no decay in conversion after five successive rounds of measurement. The advantages in both morphological and electronic structure aspects are discussed. The present study validates the promising synergetic use of distinct hot charge carriers originating from metal and semiconductor that are photoexcited in the same hybrid nanoparticle for photothermal conversion, shedding light on rational design of photothermal materials based on metal-semiconductor hybrid nanocomposites.
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高影响因子
Biosensors-Basel
·
2022
·Vol. 12
·期 6
·387
·
IF 5.743
Sen Li,Defu He,Shuning Li,Ruipeng Chen,Yuan Peng,Shuang Li,Dianpeng Han,Yu Wang,Kang Qin,Shuyue Ren,Ping Chen,Zhixian Gao
Bisphenol A (BPA) has emerged as a contaminant of concern because long-term exposure may affect the human endocrine system. Herein, a novel aptamer sensor based on magnetic separation and surface-enhanced Raman scattering (SERS) is proposed for the extremely sensitive and specific detection of trace BPA. Moreover, the capture unit was prepared by immobilizing thiolated (SH)-BPA aptamer complementary DNA on AuNP-coated magnetic halloysite nanotubes ([email protected]), and SH-BPA aptamer-modified[email protected]@Ag core–shell SERS nanotags acted as signal units. By the complementary pairing of the BPA aptamer and the corresponding DNA,[email protected]and[email protected]@AgCS were linked together through hybridization-ligation, which acted as the SERS substrate. In the absence of BPA, the constructed aptamer sensor generated electromagnetic enhancement and plasmon coupling to improve the sensitivity of SERS substrates. Owing to the high affinity between BPA and the aptamer, the aptamer probe bound to BPA was separated from the capture unit by an externally-induced magnetic field. Thus, the Raman intensity of the[email protected]@AuCS core–satellite assemblies was negatively correlated with the BPA concentration. High sensitivity measurements of BPA might be performed by determining the decline in SERS signal strength together with concentration variations. The proposed aptasensor is a promising biosensing platform for BPA detection.Keywords:surface-enhanced Raman scattering (SERS);aptasensor;bisphenol A;core–satellite assemblies
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高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jialong Li,Fanming Meng,Hao Wu,Han Zhang
The construction of Z-scheme heterostructures is one of the most effective strategies to improve photocatalytic efficiency. In this study, Ag + doped ZnIn 2 S 4 /Bi 2 S 3 composite nanosphere materials with different mass fractions of Bi 2 S 3 were successfully synthesized by the solvothermal method. Systematic studies showed that the construction of heterogeneous structures and Ag + doping could extend the optical absorption edge and provide more active sites. More importantly, it was shown by photoelectrochemical and PL spectroscopy tests that Ag: ZnIn 2 S 4 /Bi 2 S 3 has strong visible light absorption and photocarrier transfer capability. In addition, the Z-scheme mechanism of Ag: ZnIn 2 S 4 /Bi 2 S 3 was investigated by electron spin response (ESR) and active substance capture experiments, which confirmed that both superoxide radicals( O − 2 ) and hydroxyl radicals( OH) were involved in the photocatalytic reaction. The results showed that the optimized Ag: ZnIn 2 S 4 /2.5%Bi 2 S 3 degraded TC by 89.7%, 1.87 times higher than the original ZnIn 2 S 4 . This work provides a promising method for the construction of Z-scheme heterojunctions based on ZnIn 2 S 4 .
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高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Jie Xia,Xuepei Wang,Junchang Zhang,Chuiyu Kong,Wentao Huang,Xiaoshuan Zhang
To extend the application range of flexible pressure sensors and to be widely used as an economical and convenient way, researchers have made efforts toward high sensitivity, wide detection range, and low power consumption. However, most sensors can only work based on a single mechanism, thus limiting the sensing range and applicability. In view of this, we developed a dual-mechanism pressure sensor (DMPS) based on Ag nanowire/PDMS electrodes and ZnO nanoparticle-based force-sensitive membranes, which has a sandwich structure and complete flexibility under the effect of chemical bonding. It can simultaneously sense high-frequency dynamic pressure as well as static load by integrating piezoelectric and piezocapacitive effects, thereby complementing the inability of conventional piezoelectric-type sensors to continuously detect static pressure. The prepared flexible DMPS containing 20 wt % ZnO nanofiller has a pressure frequency-independent electrical output of about 2 V under 20 N force conditions and also has a long-term stability of more than 5000 pressure cycles. Moreover, it exhibits good linearity, repeatability, and stability in the 0–100 kPa detection range in the piezocapacitive mode. On the basis of multimechanism and modularity, the flexible DMPS was demonstrated for fruit quality monitoring, including avocado ripeness grading, tactile sensory gloves, and moisture loss assessment, indicating its promising applications in intelligent agricultural machines and wearable sensing systems.
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