RSC Advances
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2022
·Vol. 12
·期 15
·9435-9444
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IF 4.036
Jiajia Yang,Hongyu Duan,Xiya Wang,Huan Zhang,Zhifeng Zhang
The biological toxicity and eco-environmental risk of metal nanoparticles (MNPs) is closely related to their stability. The stability of MNPs not only depends on their own properties but also on the effects of biological and environmental factors. To better understand the interaction between biological factors and MNPs in aquatic environments, the effects of total rice root exudates (T-RRE) on the aggregation, dissolution and bioaccumulation of Ag nanoparticles (AgNPs) with different surface charges were investigated in detail. Results indicated that T-RRE can induce the aggregation and sedimentation, and hinder the dissolution of polyethyleneimine-coated AgNPs (AgNPs@PEI) with positive surface charges as well as reducing the bioaccumulation of Ag in rice roots. T-RRE had no obvious effect on the dispersion stability of AgNPs@Cit (negatively charged citrate-coated AgNPs) and AgNPs@PVP (near electrically neutral polyvinylpyrrolidone-coated AgNPs), although T-RRE could induce the dissolution of AgNPs@Cit and AgNPs@PVP. In the molecular fractions of T-RRE, high-molecular-weight root exudates (H-RRE) play a key role in inducing the aggregation of AgNPs@PEI and hindering the bioaccumulation of Ag in rice roots. Compared with H-RRE, low-molecular-weight root exudates (L-RRE) can promote the dissolution of AgNPs@Cit and AgNPs@PVP, but it can obviously promote silver accumulation in rice roots. The difference in charge intensity between L-RRE and T-RRE plays a key role in inducing the aggregation and dissolution of AgNPs with different charges. These findings provide a foundation for investigation of the interactions between rice root exudates and nanoparticles with different surface charges in complex environmental systems.
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高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
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2022
·Vol. 128
·期 4
·1-8
·
IF 2.983
Xu Tianwen,Wang Xueqin,Zhang Xin,Bai Zhongchen
An ideal surface-enhanced Raman scattering (SERS) substrate should exhibit a high electromagnetic field enhancement factor, simple preparation repeatability low cost. Here, we prepared a reproducible nanoplasmonic paper SERS substrate via a silver mirror reaction (SMR) and AgNO 3 -ascorbic acid (AgNO 3 -ASC) solution treatment method to reduce Ag nanoparticles (Ag NPs) on the surface of the flexible glass fiber filter paper (GFP). GFP with Ag NPs (AgNPs@GFP) was used for SERS to detect melamine molecules (MMs). The results showed that melamine molecules’ detection limit was up to 1 ng/mL. The maximum enhancement factor of the SERS signal reached 838, and the sensitivity was 150. This strategy of fabricating SERS substrates based on GFP can provide a new way to prepare a low-cost flexible SERS substrate and increase the sensitivity of biomolecules.
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Scientific Reports
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2022
·Vol. 12
·期 1
·1-16
·
IF 4.996
Talukder Md Eman,Pervez Md. Nahid,Jianming Wang,Stylios George K.,Hassan Mohammad Mahbubul,Song Hongchen,Naddeo Vincenzo,Figoli Alberto
In this work, Eucommia ulmoides leaf extract (EUOLstabilized silver nanoparticles (EUOL@AgNPs) incorporated sulfonated polyether sulfone (SPES)/polyethersulfone (PES) electrospun nanofiber membranes (SP ENMs) were prepared by electrospinning, and they were studied for the removal of lead (Pb(II)) and cadmium (Cd(II)) ions from aqueous solutions. The SP ENMs with various EUOL@AgNPs loadings were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscope, thermo-gravimetric analysis (TGA), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and contact angle (CA) measurements. The adsorption studies showed that the adsorption of Cd(II) and Pb(II) was rapid, achieved equilibrium within 40 min and 60 min, respectively and fitted with non-linear pseudo-second-order (PSO) kinetics model. For Cd(II) and Pb(II), the Freundlich model described the adsorption isotherm better than the Langmuir isotherm model. The maximum adsorption capacity for Cd(II) and Pb(II) was 625 and 370.37 mg g −1 respectively at neutral pH. Coexisting anions of fluoride, chloride, and nitrate had a negligible influence on Cd(II) removal than the Pb(II). On the other hand, the presence of silicate and phosphate considerably affected Cd(II) and Pb(II) adsorption. The recyclability, regeneration, and reusability of the fabricated EUOL@AgNPs-SP ENMs were studied and they retained their high adsorption capacity up to five cycles. The DFT measurements revealed that SP-5 ENMs exhibited the highest adsorption selectivity for Cd(II) and the measured binding energies for Cd(II), Pb(II), are 219.35 and 206.26 kcal mol −1 , respectively. The developed ENM adsorbent may find application for the removal of heavy metals from water.
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2022
·Vol. 169
·期 4
·047507
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IF 4.386
Li Su,Yarong Cheng,Jiaci Shi,Xuefeng Wang,Pengcheng Xu,Ying Chen,Yuan Zhang,Sen Zhang,Li Xinxin
Formaldehyde (FA) in food is harmful to human health, an effective detecting tool is highly desired especially for the on-site test. Herein, an amperometric aqueous FA sensor was fabricated by applying Pt–Ag core-shell nanoparticles as electrocatalyst. The well-characterized core-shell nanostructure exhibits high electro-catalytical activity for the detection of FA molecules in solution due to the synergistic effect of bimetallic Pt–Ag nanostructure. The proposed sensor exhibits high FA sensing performance, with a linear detection range from 1 to 100 μM and a limit of detection (LOD) down to 1.0 μM on the optimized conditions. Interferents coexisting in food samples were efficiently minimized by good selectivity. The Pt–Ag nanostructure-based FA sensor keeps catalytical activity for at least 30 d and shows good batch reproducibility. The proposed sensor was applied for the detection of FA in the food samples and satisfactory results were obtained, showing potential for the fast, simple, disposable, and cost-effective FA detecting method for food safety.
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ACS Applied Nano Materials
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2022
·
IF 6.14
Jiahui Gu,Hong Liu,Tingyu Peng,Shun Li,Li Xu,Jianming Zhang,Long Zhang
Plasmonic nanohybrids composed of semiconductors and plasmonic metal nanoparticles (NPs) have been intensively investigated in heterogeneous photocatalysis. The surface plasmonic resonance (SPR) effect of metal NPs plays a critical role in increasing light absorption and excitation of energetic carriers for photocatalysis. Most efforts are devoted to increasing the intrinsic absorptivity of the photocatalyst; however, the possible SPR scattering contribution of the metal NPs to photocatalysis has been long overlooked. In this work, we demonstrate a proof of concept of plasmonic scattering-enhanced absorption for efficient photocatalytic organic conversion in the visible to near-infrared wavelength region. With a multistep wet-chemical deposition approach, Ag NPs are encapsulated into the CeO2–Au system as the scattering core to form a Ag@CeO2–Au core@shell-satellite structure with a metal content of ∼30.6%. By varying the size (30–100 nm in diameter) and aggregation status (single NP or coupled NPs) of the Ag NP core, its scattering effect can be adjusted over a wide spectral range. This smart design results in scattered photon energy by the core composed of coupled 100 nm Ag NPs to greatly resonate with the SPR excitation of Au nanorods on the CeO2 surface over a wide spectral range from 400 to 900 nm, resulting in the confinement of the incident light in the optical path. The SPR scattering effect-induced light harvest and the near-field enhancement at the Au–CeO2 interface greatly boost the generation and separation of hot charge carriers for surface reaction, leading to a superior conversion efficiency of >90% in 3 h with a high selectively of ∼100% for oxidizing aminobenzyl alcohol to aminobenzaldehyde. This work reveals the immediate role of plasmonic scattering for light harvesting in photocatalysts.
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JOURNAL OF MATERIALS SCIENCE
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2022
·Vol. 57
·期 13
·6943-6952
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IF 4.682
Zhang Yongjun,Zhao Xiaoyu,Zhu Qi,Cheng Mingyu,Xu Wei,Wang Yaxin,Zhu Aonan,Gao Renxian,Zhang Jian,Zhang Xiaolong
As an important marker of Hepatocellular carcinoma (HCC), AFP-L3 has attracted attention. In this study, the surface-plasmon-assisted Ag nanoparticles symmetrical growth technology under magnetic field is used to fabricate the six-nanohole nanojar array containing Ag nanoparticles as the sensing substrate. The displacement of SERS signal of the optimized structure is used to detect HCC marker AFP-L3. This method has good stability, high accuracy and has great potential in the early diagnosis of HCC.
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JOURNAL OF HAZARDOUS MATERIALS
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2022
·
IF 14.224
Huiyi Yang,Qiyi He,Mingxia Lin,Li Ji,Leheng Zhang,Huanxin Xiao,Shijia Li,Qinglan Li,Xiping Cui,Suqing Zhao
Multimodal lateral flow immunoassay (LFIA) has displayed its potential to improve practicability and elasticity of point-of-care testing. Herein, multifunctional core-shell-shell Au@Pt@Ag NPs loaded with dual-layer Raman reporter molecules of 5,5′-dithiobis-(2-nitrobenzoic acid) (DTNB) with a characteristic combination of color-photothermal-Raman performance were constructed for colorimetric LFIA (CM-LFIA), photothermal LFIA (PT-LFIA) and surface-enhanced Raman scattering-based LFIA (SERS-LFIA), respectively. The highly specific nanoprobes , being obtained through the combination of the resulted dual-layer DTNB modified Au@Pt@Ag NPs with the antibody, were triumphantly utilized in exploring multimodal LFIA with one visual qualitative and two optional quantitative modes with excellent sensing sensitivity. Under optimal conditions, the limit of detection (LOD) for the model hazardous analyte dehydroepiandrosterone (DHEA) were 1.0 ng mL −1 for CM-LFIA, 0.42 ng mL −1 for PT-LFIA, and 0.013 ng mL −1 for SERS-LFIA, three of which were over 100-fold, 200-fold and 7 000-fold more sensitive than conventional visual AuNPs-based LFIA, respectively. In addition, the quantitative PT-LFIA and SERS-LFIA sensors worked well in spiked real samples with acceptable recoveries of 96.2 – 106.7% and 98.2 – 105.2%, respectively. This assay demonstrated that the developed multimodal LFIA had a great potential to be a powerful tool for accurate tracing hazardous analytes in complex samples.
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
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2022
·Vol. 51
·期 7
·3831-3842
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IF 2.047
Zhang Baozhong,He Jintao,Tian Panpan,Lv Lina,Zhu Huina,Xie Lingling,Liu Xiaolong,He Baoshan
In this study, based on the specific binding of nucleic acid aptamers (Apts) to 3,3′,4,4′-tetrachlorobiphenyl (PCB77), an ultrasensitive electrochemical aptasensor was constructed for the detection of PCB77. The Apts were captured by hairpin (HP) deoxyribonucleic acid capture probes through complementary base pairing. The large surface area of reduced graphene oxide (rGO) combined with Ag-Cu 2 O significantly improved the efficiency of electron transfer on the electrode surface and provided a large number of binding sites for HP capture probes. Streptavidin (SA)-modified CeO 2 /AuPt was used as signal-generating material to amplify electrical signals cooperatively with Ag-Cu 2 O/rGO, and it was also combined with biotin-modified nucleic acid Apts via the SA-biotin system to form signal labels, which significantly improved the sensitivity of the aptasensor. The morphology and size of the synthesized materials were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The internal structure and composition of the materials were further analyzed by x-ray photoelectron spectroscopy (XPS), x-ray diffraction (XRD), and Fourier transform infrared (FT-IR) spectroscopy. The sensor assembly process was confirmed by electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). Differential pulse voltammetry (DPV) was used to optimize the experimental conditions and evaluate the performance of the sensor. Under optimal conditions, the detection limit of the aptasensor was 0.069 ng/L, and the dynamic range was 0.1–10 3 ng/L, providing a high-quality platform for PCB77 detection. Graphical Abstract
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Journal of Materials Chemistry B
·
2022
·Vol. 10
·期 15
·2944-2951
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IF 7.571
Xiaoying Zhang,Xin Wang,Peng Wang,Qiuyue Fu,Zhaozhen Zhu,Chaocai Luo,Jieyi Chen,Yanjiao Zhang,Shaoxin Li
The surface-enhanced Raman scattering (SERS) technique has attracted increasing attention in biomedicine due to the capability of providing the molecular fingerprint information of biosamples. Two-dimensional (2D) metal nanohybrids have proven to be efficient SERS substrates for bioanalysis due to the cooperative Raman enhancement mechanism. Herein, a facile strategy for the fabrication of a novel transition metal telluride-based 2D-metal SERS substrate is proposed. Ag-niobium ditelluride (NbTe2) nanocomposites are synthesized through in situ reduction of Ag nanoparticles on NbTe2 nanosheets (NSs). The excellent SERS performance of Ag–NbTe2 NSs probably originates from the coupling effect of enhanced electromagnetic field distribution around the plasmonic nanostructure (hot spots) and the charge transfer caused by the semiconductor material after numerical simulations. Using Ag–NbTe2 NSs as an ultrasensitive SERS probe, the molecular components of three types of muscle tissues are clearly identified. An effective classification of skeletal, cardiac and smooth muscles is also realized according to their SERS data plus principal component analysis. In addition, the monitoring of the skeletal muscle stretching process is achieved by the Ag–NbTe2 NS-based SERS analysis, which represents a powerful tool for molecular exercise physiology.
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高影响因子
APPLIED PHYSICS B-LASERS AND OPTICS
·
2022
·Vol. 128
·期 3
·1-9
·
IF 2.171
Zhao Feng,Chu Yunting,Zhao Qianyun,Zhang Weiwei,Sun Jingchang,Li Chengren
A series of CaSrSiO 4 : Yb 3+ , Er 3+ , x Ag phosphors have been prepared by high-temperature solid-state reaction method. Scanning electron microscope (SEM) images show that more small spherical particles gather together to form bigger cluster when Ag nanoparticles are co-doped into CaSrSiO 4 : 9Yb 3+ , 1Er 3+ nanophosphor. Photoluminescence intensities of samples co-doped Ag nanoparticles enhance significantly and the optimized Ag concentration is 0.6 mol%. The fluorescence intensity ratio, the absolute sensitivity, relative sensitivity and temperature resolution are measured, computed and discussed in the range of 303–703 K. The results show that all sensing performances of CaSrSiO 4 : Yb 3+ , Er 3+ , 0.6Ag phosphor are superior to these of the sample un-doped Ag particles and the maximum S A value can go up to 7.3 × 10 –3 K −1 , indicating that CaSrSiO 4 : 9Yb 3+ , 1Er 3+ , 0.6Ag designed and prepared in this work is a promising optical high-temperature sensing material and it is appropriate to practical application in comprehensive fields.
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ADVANCED POWDER TECHNOLOGY
·
2022
·
IF 4.969
Cong Lu,Haifeng Zhou
The easy recombination of electron-hole pairs produced by monomeric photocatalysts under light exposure severely limits their application in wastewater treatment. Based on this, BiOCOOH/Ag/AgBr ternary photocatalysts in flower-like microspheres were controllably synthesized by precipitation photoreduction and characterized by various techniques. In addition, the effects of different molar ratio of BiOCOOH and AgBr, catalyst dose, pH and coexisting ions on the photocatalytic degradation of rhodamine B (RhB) and tetracycline (TC) were investigated. The results showed that the BOC/Ag/AgBr-0.5 composite exhibited excellent photocatalytic activity for the degradation of RhB and TC. The excellent photocatalytic activity was mainly attributed to the surface plasmon resonance (SPR) effect of metallic Ag and charge transfer mechanism between composites, thus promoting charge separation. The degradation efficiency of RhB and TC was 92.7% and 72.3% with the degradation rate constant of 0.073 and 0.023 under light irradiation of xenon lamp in 30 and 45 min, respectively, which was 6 and 2 times higher than that of BiOCOOH and AgBr. The stability studies showed that BOC/Ag/AgBr-0.5 maintained a high catalytic activity after four cycles. The results of radical capture experiments showed that h + and · O 2 – were the main reactive radicals, while · OH played a secondary role in the photocatalytic system. Subsequently, a potential photocatalytic mechanism was proposed based on the experimental results.
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Journal of Physical Chemistry C
·
2023
·
IF 3.7
Zhijie Chen,Chao Wang,Ji Yu,Xingming Yang,Xibin Xu,Min Gu
In this study, Ag2S samples are characterized using X-ray diffraction, X-ray photoelectron spectroscopy, differential scanning calorimetry, and impedance spectroscopy. At 447 K, an AC conductivity jump of about two orders of magnitude is observed, and an endothermic peak is measured by differential scanning calorimetry, apparently resulting from the β-to-α phase transition, i.e., the order–disorder transition. A silver vacancy proportion of 2.2% is obtained by refinement of the X-ray diffraction profile. The dielectric loss peaks and analysis of the observed complex impedance peaks indicate four different relaxation processes, namely, P1, P2, P3, and P4, from low to high temperature. P1 and P2 are obviously the migration of silver ions from two types of lattice sites to their nonequivalent nearest-neighbor vacancies. P3 involves the migration of interstitial silver ions to adjacent interstitial sites. An Arrhenius-to-VFTH crossover of the P4 relaxation time is inferred to the hopping of the individual silver ion and then the cooperative jumps of several ions in the disordered region of the silver sublattice upon heating.
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