APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Deyu Wang,Kun Li,Cong Zhou,Lei lei,Yoann de Rancourt de Mimérand,Xiaoyun Jin,Jia Guo
In this study, we expose various techniques based on cold plasma discharge (CPD), and more precisely aqueous-phase plasma-aided grafting (APPAG), to efficiently modify the surface of polymers as well as fabric made of natural fibers. Several directions were investigated to ultimately add a functional coating providing an antimicrobial effect to textiles. Our strategy relies on the immobilization of silver nanoparticles (AgNPs) and Bi 2 MoO 6 (BMO) – a robust inorganic photocatalyst that can be activated by visible light – microflowers, at the surface of cotton fabric fibers. Notably, an in situ complexation-assisted precipitation route (ISCAP – an original method derived from CPD) was successfully employed to generate a very uniform coating of silver nanoparticles at the surface of organic substrates. As we demonstrate in this study, the surface functionalization with BMO and silver provides a significant protection against bacteria in dark conditions, through a bacteriostatic effect of nano silver, and under low-intensity artificial visible light (thanks to the photocatalytic effect of BMO/Ag), hence suitable for an indoor environment such as hospitals. Our composite nanomaterial, cotton/BMO/AgNPs, was assessed through antibacterial testing with Escherichia coli (E. coli) and Staphylococcus aureus (S. Aureus) , showing a pronounced antimicrobial effect with both strains. This study opens prospects for the functionalization of natural or artificial fiber materials with possible applications in the field of biomedical protective equipment such as bandages, masks or technical cloths; or even photocatalysis.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Enzhu Lin,Jiang Wu,Zihan Kang,Ni Qin,Kanghui Ke,Dinghua Bao
Piezocatalysis is one of the green and promising catalytic technologies for the degradation of organic pollutants. Surface modifications such as exposed facet engineering and surface decoration of nanoparticles (NPs) are simple but useful enhancement strategies for a catalytic system. However, the synergistic effect and mechanism of facet engineering and dual-cocatalyst decoration on piezocatalytic activity are still ambiguous and more investigations are expected. Herein, the piezocatalytic activities of BaTiO3 (BTO) polyhedrons with anisotropic {001} and {110} facets and BTO cubes with isotropic {001} facets were compared. Furthermore, BaTiO3 (BTO) convex polyhedrons with selectively deposited Ag NPs and uniformly loaded Co3O4 quantum dots (QDs) are rationally synthesized through photochemical deposition. The individual and synergistic effects of Ag NPs and Co3O4 QDs on the piezocatalytic activities are systematically studied. It was found that dual-cocatalyst-modified BTO possesses the highest piezocatalytic activity in methyl orange degradation, with a reaction constant k of 0.0539 min–1, around 5, 2.2, and 1.3 times higher than that of nonmodified and Ag NP- and Co3O4 QD-modified BTO, respectively. Moreover, dual-cocatalyst-decorated BTO also exhibits excellent piezocatalytic performance in nondye pollutant degradation, with ∼100% tetracycline hydrochloride decomposed in 60 min. By analyzing the contribution, quantifying the amount of different free radicals, and comparing the chemical states of surface elements before and after piezocatalytic measurements, it was inferred that facet-dependent Ag NPs acted as efficient electron-transport sites, while uniformly loaded Co3O4 QDs served as hole-transfer sites to fully facilitate the migration of electrons and holes in a piezocatalytic reaction. This research presents a rational and effectual modification strategy to enhance the piezocatalytic activity of piezocatalysts and gives a thorough discussion of the enhanced mechanism.
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高影响因子
Polymers
·
2023
·Vol. 15
·期 10
·2352
·
IF 5
Linxinzheng Guo,Kun Hu,Haibo Wang
Polyvinyl alcohol (PVA) is a polymeric material with good biocompatibility, excellent hydrophilicity, and a large number of hydroxyl groups. However, due to its insufficient mechanical properties and poor inhibition of bacteria, it has a lack of applications in wound dressings, stent materials, and other fields. In this study, a simple method was used to prepare composite gel materials: Ag@MXene-HACC-PVA hydrogels with a double-network structure were prepared using an acetal reaction. Due to the double cross-linked interaction, the hydrogel has good mechanical properties and is resistant to swelling. The adhesion and bacterial inhibition were enhanced due to the addition of HACC. In addition, the strain sensing properties of this conductive hydrogel were stable, and the GF (specification factor) was 1.7617 at 40–90% strain. Therefore, the dual-network hydrogel with excellent sensing properties, adhesion properties, antibacterial properties, and cytocompatibility has potential applications in biomedical materials, especially as a tissue engineering repair material.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
An-Ni Zheng,Zhao-Yun Wang,Jia-Qiang Yang,Lei Jin,Fang-Zu Yang,Dong-Ping Zhan
Advanced Ag nanoparticles (Ag NPs) were prepared by wet chemical oxidation–reduction method, using mainly the tannic acid as reducing agent and carboxymethylcellulose sodium as stabilizer . The prepared Ag NPs uniformly disperse and are stable for more than one month without agglomeration. The studies of transmission electron microscopy (TEM) and ultraviolet–visible (UV–vis) absorption spectroscopy indicate that the Ag NPs are in homogeneous sphere with only 4.4 nm average size and narrow particle size distribution . Electrochemical measurements reveal that the Ag NPs behave excellent catalytic activity for electroless copper plating using glyoxylic acid as reducing agent. In situ fourier transform infrared ( in situ FTIR) spectroscopic analysis combined with density functional theory (DFT) calculation illustrate that the molecular oxidation of glyoxylic acid catalyzed by Ag NPs is as the following routes: glyoxylic acid molecule first is adsorbed on Ag atoms with carboxyl oxygen terminal, then hydrolyzed to diol anionic intermediate, and last oxidized to oxalic acid . Time-resolved in situ FTIR spectroscopy further reveals the real-time reactions of electroless copper plating as follows: glyoxylic acid is continuously oxidized to oxalic acid and releases electrons at the active catalyzing spots of Ag NPs, and Cu(II) coordination ions are in situ reduced by the electrons. Based on the excellent catalytic activity, the advanced Ag NPs can replace the expensive Pd colloids catalyst and successfully apply in through-holes metallization of printed circuit board (PCB) by electroless copper plating.
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OPTICS EXPRESS
·
2023
·Vol. 31
·期 10
·16484-16494
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IF 3.8
Sha HaiYang,Wang Zhengkun,Zhu Yong,Zhang Jie
To achieve high sensitivity and uniformity simultaneously in a surface-enhanced Raman scattering (SERS) substrate, this paper presents the preparation of a flexible and transparent three-dimensional (3D) ordered hemispherical array polydimethylsiloxane (PDMS) film. This is achieved by self-assembling a single-layer polystyrene (PS) microsphere array on a silicon substrate. The liquid-liquid interface method is then used to transfer Ag nanoparticles onto the PDMS film, which includes open nanocavity arrays created by etching the PS microsphere array. An open nanocavity assistant soft SERS sample, “Ag@PDMS,” is then prepared. For electromagnetic simulation of our sample, we utilized Comsol software. It has been experimentally confirmed that the Ag@PDMS substrate with silver particles of 50 nm in size is capable of achieving the largest localized electromagnetic hot spots in space. The optimal sample, Ag@PDMS, exhibits ultra-high sensitivity towards Rhodamine 6 G (R6G) probe molecules, with a limit of detection (LOD) of 10−15 mol/L, and an enhancement factor (EF) of ∼1012. Additionally, the substrate exhibits a highly uniform signal intensity for probe molecules, with a relative standard deviation (RSD) of approximately 6.86%. Moreover, it is capable of detecting multiple molecules and can perform real detection on non-flat surfaces.
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ACS Applied Nano Materials
·
2021
·
IF 5.097
Siying Liu,Hai-Sheng Su,Zhengxia Yang,Yun Zhang
The identification of cancer cells and tumors significantly advances the accurate diagnosis of cancer and improves the patient survivor rates. However, it remains challenging to achieve the rapid and label-free differentiation of cancer cells from their normal counterparts. Herein, we developed a rapid and effective method for the synthesis of Ag nanorods (NRs) with high uniformity and yield. The surface-enhanced Raman scattering (SERS) substrates demonstrated uniformity and reliability, with a low relative standard deviation (RSD) of 10% and an enhancement factor (EF) of 3.32 × 105. The optimized AgNR SERS substrates were then applied in the quantitative analysis of creatinine and furthermore the bioanalysis of cell lysates for cell classification. Specifically, a high sensitivity with a low detection limit (LOD) of 5.3 μM and a limit of quantification (LOQ) of 17.68 μM was achieved for the detection of creatinine. More importantly, label-free SERS analysis showed the distinct spectral features of the cell lysates for normal breast cell strains (MCF-10A) and breast cancer cell strains (MCF-7, MDA-MB-231). Statistical analysis, such as t-test, principal component analysis (PCA), and orthogonal partial least-squares discriminant analysis (OPLS-DA) aided in the clear discrimination between the normal and cancer groups and further in differentiating the two cancer groups. These results demonstrate the great potential of the combination of a high-quality AgNR SERS substrate and statistical analysis for the identification of cancers.
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SENSORS AND ACTUATORS B-CHEMICAL
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2021
·
IF 7.46
Tingting Meng,Meirong Shi,Yingcen Guo,Huichao Wang,Nuo Fu,Zhiping Liu,Bo Huang,Chao Lei,Xiaoyu Su,Bo Peng,Ziwei Deng
Surface-enhanced Raman scattering (SERS) has been demonstrated to be an ultrasensitive and real-time analysis technique for detection of analytes with its specific fingerprint-identification feature. However, most traditional SERS-active substrates are suffering from their high expense, intricate fabrication processes and non-recyclability, which seriously hinder the applicable universality of SERS analytical technique. Thus, it is highly desired to develop highly sensitive SERS-active substrates that can be recovered in an easy way. Herein, we present a facile and inexpensive approach for fabrication of photocatalytically active Ag-coated CuO (denoted as CuO@Ag) microbowl array substrate, applicable for the highly efficient, ultrasensitive, and recyclable SERS detection. In this approach, a multifunctional CuO@Ag microbowl array is achieved based on the pre-synthesis of a quasi-2D CuO microbowl array by employing the colloidal lithography on Cu foil combined with the subsequent chemical oxidation reaction, and followed by the sputtering deposition of Ag layer on the CuO microbowl array. Importantly, this CuO@Ag microbowl array can serve as SERS-active substrate with extra advantageous feature of excellent photocatalytic activity , which enables self-degradation of analytes after the SERS-detection under visible light illumination. Remarkably, this allows for recyclable SERS detection. In the detection of model probe molecules, e.g., methylene blue (LOD: 1.3 × 10 −16 M) and Aflatoxin B 1 (LOD: 6.5 × 10 − 15 M) , approximate femtomolar level can be reached. Impressively, this substrate allows multi-detection without compromising the SERS activity. The present research provides a new and cost-effective strategy for synthesizing recyclable SERS-active substrates, which suggests plausible ways in the design of multi-functional SERS-active substrates.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Tao Li,Yuhua Li,Xike Zhang,Jiawei Yuan,Junkang Guo,Pan Wang,Gehong Wei,Chun Chen
The widespread application of metal-based nanoparticle (MNPs)/reduced graphene oxide (rGO) composites inevitably leads to their release into soils. However, we lack a detailed understanding of the bacterial community response to MNPs-rGO exposure in farmland soils. Here, we conducted a soil microcosm experiment to analyze the potential impact of MNPs-rGO on bacterial communities in two field soils via high-throughput sequencing. The change in alpha diversity of bacterial communities was more susceptible to Ag-rGO and ZnO-rGO treatments than CuO-rGO. In both soils, MNPs-rGO significantly changed the bacterial community structure even at a low dose (1 mg kg −1 ). The bacterial community structure was most strongly affected by Ag-rGO at 30 days, but the greatest changes occurred in ZnO-rGO at 60 days. The differences in soil properties could shape bacterial communities to MNPs-rGO exposure. Distance-based redundancy analysis and functional annotation of prokaryotic taxa showed that some bacterial species associated with nitrogen cycling were greatly influenced by Ag-rGO and ZnO-rGO exposure. In sum, Ag-rGO and ZnO-rGO may potentially affect bacterial communities and nitrogen turnover under long-term realistic field exposure. These findings present a perspective on the response of bacterial communities to MNPs-rGO and provide a fundamental basis for estimating the ecological behavior of MNPs-rGO.
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EUROPEAN POLYMER JOURNAL
·
2023
·
IF 6
Hao Su,Zhenxiao Zhang,Weixing Song,Kaixiang Shi,Fei Cheng,Meng Hao,Yijia Ma,Yuanbo Chen,Guangfeng Wu,Ying Song
In this study, a novel electrochromic hydrogel AG/P(AAm-AAc)/P 2 W 18 was prepared by loading polyoxometalate K 6 P 2 W 18 ·10H 2 O (P 2 W 18 ) into a double-network hydrogel formed with agar (AG) and copolymer of polyacrylamide (PAAm) and polyacrylic acid (PAAc). The mechanical properties of hydrogels can be tuned by adjusting the proportion of PAAc in the copolymer P(AAm-AAc). Electrochromic hydrogel shows the best mechanical properties when the proportion of PAAc is 10 % (AG/P(AAm-AAc)-10/P 2 W 18 ), and the maximum elongation at break and the fracture stress are about 2.0 and 2.5 times higher than that of pure PAAm. P 2 W 18 gives good electrochromic properties to the hydrogels without the addition of electrolytes. Under the external voltage, the electrochromic hydrogel changes from colorless to blue with the optical contrast up to 65.54 % at 700 nm. The electrochromic device based on this hydrogel is simple in structure, easy to manufacture and highly stretchable, which has good application potential in the field of wearable electronics.
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ADVANCED FUNCTIONAL MATERIALS
·
2023
·
IF 19
Xuelian Zeng,Youyi Ding,Xianrong Yuan,Conghui Jiang,Yanan Wang,Yuhang Song,Yawen Li,Beibei Shao,Yusheng Wang,Baoquan Sun
Photo-mediated synthesis wielding localized surface plasmon resonance (LSPR) of nanoscale metal is widely applied to sculpt silver (Ag) nanocrystals with controllable dimensions and morphologies. However, this photo-mediated strategy remains underutilized owing to low efficiency and inferior quality in conventional batch reactors. Here, the effective synthesis of Ag nanocrystals is demonstrated via flow reactors and elucidates the photo-mediated anisotropic growth mechanism. The investigation reveals that the intersection between excitation wavelengths and LSPR of Ag nanocrystals is a prerequisite for their growth. The final morphology is highly correlated with excitation wavelengths, which modulate the redox potential (reaction barrier) of Ag nanocrystals featuring distinct defective structures. Thus, by utilizing tandem-connected flow reactors, size-controllable Ag nanoplates can be yielded in a highly efficient cascade growth manner. In addition, composite conductive ink (submicron/nano-Ag particles) is employed to create high-performance flexible transparent electrodes. A sixfold conductivity enhancement especially under low sintering temperature (<80 °C), along with superior transmittance (over 90%), and distinguished cyclic durability (negligible resistance change over 1000 cycles) are achieved simultaneously. The study not only establishes comprehensive insights into the acquisition of well-defined Ag nanocrystals in flow reactors but also ushers in enormous feasibility toward high-performance and cost-effective flexible electronics.
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POLYMER TESTING
·
2023
·
IF 5.1
Yi Ding,Wenwen Yu,Jie Zhang,Wenying Liu,Fengbo Zhu,Yanan Ye,Qiang Zheng
The Ag@MgO nanoparticles (NPs), consisting of silver NPs with a size range of 6–15 nm well-dispersed on the surface of MgO nanoparticles, were synthesized using a simple and efficient in situ synthesis method. These NPs exhibited superior antibacterial activity compared to bare MgO NPs. Subsequently, they were incorporated into poly(butylene succinate- co -terephthalate) (PBST) matrix to prepare antibacterial food packaging films. The effects of Ag@MgO NPs morphology on the compatibility, mechanical, water vapor barrier, UV blocking and antibacterial properties of PBST matrix were evaluated. Unmodified Ag@MgO NPs caused agglomeration and poor mechanical properties. However, when the Ag@MgO NPs were surface modified and interacted with the PBST matrix, the dispersion of nanoparticles and crystallinity improved, resulting in enhanced tensile strength and barrier properties of the composite films. Furthermore, the well-formed of Ag@MgO NPs in the films played a positive role in controlling the growth of microorganisms. Upon incorporation of the modified Ag@MgO NPs, the PBST nanocomposite films exhibited a 23.5% increase in the tensile strength and a 63% decrease in the water vapor permeability compared to PBST films. Moreover, the UV blocking performances were enhanced, and high antibacterial rates of 99.8% and 99.7% were achieved against E. coli and S. aureus , respectively. All the results indicate that the PBST incorporating modified Ag@MgO NPs have excellent potential for use in food packaging applications.
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Coatings
·
2023
·Vol. 13
·期 9
·1557
·
IF 3.4
Yan Gao,Xin Chen,Ping Xu,Jie Chen,Shihua Yu,Zhigang Liu,Xiaodan Zeng
A novel magnetic fluorescent nanoprobe (Fe3O4@ZnS@MPS(MFNPs)) was synthesized, which recognized and cooperated with Ag+ions, and a rapid method for detecting Ag+was established in solution. It was found by fluorescence spectroscopy analysis that the MFNPs could detect Ag+in PBS solution and, upon addition of Ag+ions, the fluorescence (FL) of MFNPs could be quenched significantly. The sensor has a low limit of detection (LOD) of 7.04 µM for Ag+. The results showed that MFNPs were extremely specific and sensitive for the quantitative detection of Ag+over a wide pH range. Then, the recognition mechanism between MFNPs and guest Ag+was explored via measures of infrared spectroscopy and electron microscopy. It was speculated that the oxygen atoms in the sulfonic acid group cooperated with Ag+to form a synergistic complexation. The assay was successfully used to determine the content of Ag+ in real samples.Keywords:magnetic fluorescent nanosensor;selective recognition;silver ion;3-sulfhydryl-1-propane sodium (MPS)
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