MICROCHEMICAL JOURNAL
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2022
·
IF 5.304
Yong Zhao,Yixuan Xia,Juerui Zhang,Hongde Liu,Yinhui Yi,Gangbing Zhu
In this work, based on the unique self-adsorption and reduction capacities of Ti 3 C 2 T x MXenes toward silver ion, silver nanoparticles (Ag NPs) as reference probe are synthesized and immobilized on the surface of Ti 3 C 2 T x nanoribbons (Ti 3 C 2 T x R) to form Ag-Ti 3 C 2 T x R nanohybrid with a simple stirring-method, and carbon nanotubes (CNTs) are introduced to conjugate Ag-Ti 3 C 2 T x R for inhibiting their aggregation and improving further the sensing performance. Via selecting paracetamol (PA) as a model analyte, a ratiometric voltammetric sensing strategy is proposed by using Ag-Ti 3 C 2 T x R/CNTs as electrode materials on the basic of the collaborative advantages of Ag NPs, Ti 3 C 2 T x R and CNTs: in the absence of PA, Ag-Ti 3 C 2 T x R/CNTs modified electrode displays only an electrochemical signal from the oxidation of Ag 0 ; while in the presence of PA, a varied signal of PA along with its concentration can be observed coupled with a quite stable oxidation signal of Ag 0 . Based on this principle, a highly sensitive and reliable ratiometric sensing platform is designed for PA detection by recording the ratio of signals between PA and Ag 0 . It’s expected that this work exploits a new research field in electrochemical sensors by combining the synthetic advantages of MXenes and metal elements.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 6
·1-10
·
IF 2.8
Zhou Jintao,Zang Yue,Wang Yu,Chu Liang,Li Guodong,Xu Rui,Yan Wensheng
Silver nanowires have great development potential in the field of transparent electrodes, and their optoelectronic properties are closely related to the morphology and composition. During the synthesis of polyol method, the aspect ratio of AgNWs can be tailored using PVP with different molecular weights, and the diameter of AgNWs can be tuned by incorporating halides. Here, the synergistic effect of Cl − and Br − in the mixed PVP system were deeply investigated by adjusting the concentration ratio of Cl − and Br − . The growth mechanism of silver nanowires was studied by monitoring the acidity of the reaction process. It was found that under the assistance of PVP with different molecular weights, the coordination of Cl − and Br − greatly increased the activation energy of the reaction, which played a key role in the nucleation and growth of AgNWs. As a result, high-quality AgNWs with an average length of 35.7 μm and an average diameter of 67 nm were synthesized at the optimized concentration ratio of Cl − and Br − . Finally, the synthesized silver nanowires were deposited as conductive films on glass to obtain high-performance transparent electrode with a sheet resistance of 22.38 Ω/sq and transmittance of 83.95%.
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Nanomaterials
·
2023
·Vol. 13
·期 2
·334
·
IF 5.3
Jie Li,Qiutian She,Wenxi Wang,Ru Liu,Ruiyun You,Yaling Wu,Jingzheng Weng,Yunzhen Liu,Yudong Lu
Label-free surface-enhanced Raman scattering (SERS) analysis shows tremendous potential for the early diagnosis and screening of colon cancer, owing to the advantage of being noninvasive and sensitive. As a clinical diagnostic tool, however, the reproducibility of analytical methods is a priority. Herein, we successfully fabricated Ag NPs/cellulose nanocrystals/graphene oxide (Ag NPs/CNC/GO) nanocomposite film as a uniform SERS active substrate for label-free SERS analysis of clinical serum. The Ag NPs/CNC/GO suspensions by self-assembling GO into CNC solution through in-situ reduction method. Furthermore, we spin-coated the prepared suspensions on the bacterial cellulose membrane (BCM) to form Ag NPs/CNC/GO nanocomposite film. The nanofilm showed excellent sensitivity (LOD = 30 nM) and uniformity (RSD = 14.2%) for Nile Blue A detection. With a proof-of-concept demonstration for the label-free analysis of serum, the nanofilm combined with the principal component analysis-linear discriminant analysis (PCA-LDA) model can be effectively employed for colon cancer screening. The results showed that our model had an overall prediction accuracy of 84.1% for colon cancer (n= 28) and the normal (n= 28), and the specificity and sensitivity were 89.3% and 71.4%, respectively. This study indicated that label-free serum SERS analysis based on Ag NPs/CNC/GO nanocomposite film combined with machine learning holds promise for the early diagnosis of colon cancer.Keywords:graphene oxide;label-free;PCA-LDA;colon cancer;SERS
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
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IF 4.4
Hui Guo,Xiaohui Ren,Xinyue Song,Xin Li
In this work, we fabricated a 300 nm-sized silver-coated silica (SiO 2 @Ag) SERS substrate. Based on SiO 2 @Ag, we designed SiO 2 @Ag@molecular imprinted polymers (SiO 2 @Ag@MIPs) to realize selectively detection of amoxicillin by coating a molecular imprinted layer averagely thinner than 10 nm on SiO 2 @Ag. The as-prepared SERS-active substrate demonstrates excellent enhancement for amoxicillin as well as the enhancement factors were 1.63 × 10 6 of SiO 2 @Ag@MIPs and 2.97 × 10 5 of SiO 2 @Ag, respectively. The SiO 2 @Ag@MIPs core–shell hybrids as SERS substrates and the minimum detectable concentration of amoxicillin was as low as 2.7 × 10 -9 M, and the detection limit of SiO 2 @Ag was 2.7 × 10 -7 M. The linear relationship between intensities of characteristic peaks and concentrations of amoxicillin was established. Both SiO 2 @Ag and SiO 2 @Ag@MIPs substrates were highly sensitive and could achieve qualitative and semi-quantitative analysis of amoxicillin in aqueous media with good linear correlations. Based on the above, SiO 2 @Ag@MIPs will be conducive to detecting actual samples and expanding the practical application.
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ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 33
·期 5
·2210997
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IF 19.924
Tao Cheng,Xuan-Li Yang,Sheng Yang,Lang Li,Zhong-Ting Liu,Jie Qu,Chao-Fu Meng,Xiang-Chun Li,Yi-Zhou Zhang,Wen-Yong Lai
Flexible transparent supercapacitors (FTSs) have aroused considerable attention. Nonetheless, balancing energy storage capability and transparency remains challenging. Herein, a new type of FTSs with both excellent energy storage and superior transparency is developed based on PEDOT:PSS/MXene/Ag grid ternary hybrid electrodes. The hybrid electrodes can synergistically utilize the high optoelectronic properties of Ag grids, the excellent capacitive performance of MXenes, and the superior chemical stability of PEDOT:PSS, thus, simultaneously demonstrating excellent optoelectronic properties ( T : ≈89%, R s : ≈39 Ω sq −1 ), high areal specific capacitance, superior mechanical softness, and excellent anti-oxidation capability. Due to the excellent comprehensive performances of the hybrid electrodes, the resulting FTSs exhibit both high optical transparency (≈71% and ≈60%) and large areal specific capacitance (≈3.7 and ≈12 mF cm −2 ) besides superior energy storage capacity ( P : 200.93, E : 0.24 µWh cm −2 ). Notably, the FTSs show not only excellent energy storage but also exceptional sensing capability, viable for human activity recognition. This is the first time to achieve FTSs that combine high transparency, excellent energy storage and good sensing all-in-one, which make them stand out from conventional flexible supercapacitors and promising for next-generation smart flexible energy storage devices.
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RSC Advances
·
2022
·Vol. 12
·期 55
·36012-36017
·
IF 4.036
Ya Di,Jiyao Zheng,Yunwang Zhao,Zikai Yang,Changshun Xie,Jiahan Yu,Yue Zheng,Liming Gao
In this work, a novel strategy of colorimetric and photothermal dual-mode sensing determination of ascorbic acid (AA) based on a Ag+/3,3′,5,5′-tetramethylbenzidine (TMB) system was developed. In this sensing system, Ag+ could oxidize TMB with a distinct color change from colorless to blue color, strong absorbance at 652 nm and a photothermal effect under 808 nm laser irradiation due to the formation of oxidized TMB (oxTMB). When AA was present, oxTMB was reduced accompanied by a change from blue to colorless, and a decrease in absorption peak intensity and the photothermal effect. AA concentration showed a negative linear correlation with the value of both the absorbance intensity at 652 nm and temperature in the range of 0.2–10 μM (A = −0.03C + 0.343 (R2, 0.9887; LOD, 50 nM); ΔT = −0.57C + 8.453 (R2, 0.997; LOD, 7.8 nM)). Based on this, a sensing approach for detection of AA was proposed with dual-mode and without the complicated synthesis of nanomaterials. The photothermal effect and colorimetric signal provided a dual-mode detection strategy for AA, overcoming the limitations of any single mode. This colorimetric and photothermal dual-mode detection has great potential in the detection of AA in clinical pharmaceuticals and the construction of portable and highly sensitive sensors.
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ACS Applied Nano Materials
·
2022
·
IF 6.14
Yaya Fang,Weiwei Lu,Peng Xu,Kaisheng Yao,Jun Zhang,Xuefeng Wei,Shuge Peng,Kunpeng Sun
In this work, we propose a plasmon-mediated method to activate oxygen for oxidizing benzyl alcohols to aldehydes. First, hollow Ag@Pd core–shell nanoparticles were prepared and characterized and afterward explored for selective oxidation of benzyl alcohols under visible light illumination. Then, electron paramagnetic resonance analysis and spectroscopic measurements suggested that the main active species responsible for the selective oxidation was 1O2, which was subsequently proved to be generated from the transformation of superoxide radicals •O2–. The light illumination and the presence of a Pd shell were the prerequisites for the successful generation of •O2– and 1O2. Furthermore, the wavelength-dependent performance of Ag@Pd verified the plasmon-mediated nature of these core–shell-type nanocatalysts. Finally, a plausible mechanism of plasmonic activation of oxygen and selective oxidation of benzyl alcohols on Ag@Pd was proposed. Our research opens a green and sustainable way to activate molecular O2 into 1O2 for selective oxidation.
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COMPOSITES PART B-ENGINEERING
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2022
·
IF 11.322
Xinyue Wang,Huan Cheng,Yuanzhi Min,Xian Li,Lijun You,Jumei Li
In this study, a crystalline mesoporous ZrO 2 interlayer allowing for enrichment capability and photocatalytic activity was introduced to develop a novel magnetic Fe 3 O 4 /m-ZrO 2 /Ag nanocomposite combined with excellent SERS activity and photocatalytic property. The coverage of Ag nanoparticles on Fe 3 O 4 /m-ZrO 2 /Ag was well controlled to tune their SERS sensitivity by varying the feed amount of AgNO 3 . Several characterization methods were utilized to investigate their composition, morphology and crystal structure. The SERS experiments demonstrated Fe 3 O 4 /m-ZrO 2 /Ag nanocomposites possessed markedly SERS sensitivity, exceptional signal reproducibility and excellent storing stability. They could sense R6G and Cr (VI) at the concentrations of 10 −9 and 5 × 10 −8 M, respectively. Beyond that, the Fe 3 O 4 /m-ZrO 2 /Ag nanocomposites effectively accomplished recyclable detecting R6G and Cr (VI) in 5 cycles through facile photocatalytic removal of pollutants under UV irradiation. Altogether, the novel Fe 3 O 4 /m-ZrO 2 /Ag nanocomposites prepared in this study have high SERS sensitivity and good photocatalytic performance, which is of great significance for environmental detection and ecological restoration.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
·
IF 8.025
Meng Zhang,Yuqi Zheng,Yang Jin,Dong Wang,Guohui Wang,Xin Zhang,Yanxin Li,Shaoxiang Lee
Developing novel bilayer food packing film having the ability to prevent bacterial infections and capable of inhibiting oxidation is utmost important, since bacterial infections and oxidation can cause food spoilage. Ag-Metal−organic framework loaded p-coumaric acid modified chitosan (P-CS/Ag@MOF) or chitosan nanoparticles (P-CSNPs/Ag@MOF) and polyvinyl alcohol/starch (PVA/ST) were used as the upper film and lower layer film to successfully prepare a bilayer composite film. The microscopic morphology, water resistance, oil resistance, oxidation resistance, optical properties, cytotoxicity and antibacterial properties of the composite films were compared. The results showed that the surface of P-CS/Ag@MOF bilayer was relatively smooth and its tensile strength (TS) was higher (27.67 MPa). Among them, P-CS/Ag@MOF bilayer films had better oil resistance and oxidation resistance activity. In addition, the P-CS/Ag@MOF bilayer film had good UV-blocking properties and transparency. P-CSNPs/Ag@MOF bilayer film had higher antibacterial activity and cytotoxicity.
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高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Zi-Kang Tan,Ji-Lai Gong,Si-Yuan Fang,Juan Li,Wei-Cheng Cao,Zeng-Ping Chen
Biofouling was a considerable issue in the water treatment by membrane technology. In this study, high anti-bacterial property Ag-MOF was synthesized followed by embedding into polyamide layer with vacuum-assisted interfacial polymerization process to prepare an Ag-MOF incorporated membrane. The successful preparation of Ag-MOF and membranes was verified by FT-IR, FESEM, XPS, XRD, BET, zeta potential and contact angle test. On account to the strong hydrophility, porous structure, electronegativity and antibacterial property of Ag-MOF, modified membranes showed excellent performance for dyes, salts and bacteria. The water permeability of modified membranes was increased from 9.2 to 14.3 L m -2 h −1 bar −1 and the rejection rate of MO, MB and RB of the optimum membranes were 95.4%, 87.8% and 99.3%, respectively. The rejection rate of Na 2 SO 4 and MgSO 4 were increased from 54.0% and 36.6% to 84.1% and 73.1%. The sterilization rate of modified membranes to E. coli and S. aureus both exceeded 99%. The leaching test of Ag + evaluated the potential mechanism of anti-bacterial property. Moreover, dynamic bio-fouling test were used to detect the actual status in the filtration process. Those results suggested that modified membranes showed a strong resistance to bio-foulants thus enlarged the scope of application of membranes for water treatment.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Jiangfu Zheng,Xiang Tang,Changzheng Fan,Yaocheng Deng,Xiaoming Li,Qi Yang,Dongbo Wang,Abing Duan,Jun Luo,Zhuo Chen,Baowei Zhang
In this study, the degradation of nitenpyram (NTP) using Ag@AgCl/ZnAl-LDH (AACMO) material photocatalytically activated peroxymonosulfate (PMS) system was analyzed. As photocatalysts, Ag@AgCl and calcined zinc-aluminum layered double hydroxide (MMO) had high efficiency to achieve the separation of charge. In addition, the electron injection from AACMO to PMS facilitated the production of active species. Through the AACMO/PMS/Vis system, 40 mg/L of nitenpyram (NTP, 50 mL) could be removed in 45 min with the use of 0.8 g/L of photocatalyst and 0.2 g/L of PMS on the basis of optimal reaction conditions and visible light (780 nm > λ > 420 nm). According to electron paramagnetic resonance technology and free radical quenching tests, the removal of contaminants was promoted by 1 O 2 , h + , SO 4 - •, •O 2 – , and •OH. Moreover, the photodegradation of NTP occurring within the AACMO/PMS/Vis system was almost equally effective for the water from four different water bodies. In general, the AACMO/PMS/Vis system had high efficiency and could be employed for the water pollution control in agricultural production.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Fu Wan,Yu Lei,Changding Wang,Xinyuan Zhang,Honglin He,Lei Jia,Tingting Wang,Weigen Chen
Accurately evaluating the aging state of oil paper insulation in electrical equipment is a key to ensure the safe operation of the power transformer. For achieving highly sensitive in-situ detection of dissolved furfural in transformer oil with good reproducibility, flower-like silver nanoparticles modified with carbon nanotubes (CNTs@Ag-F-AgNPs) was synthesized by a combination of electroless silver plating and redox method. The large specific surface area and strong adsorption capacity of CNTs@Ag promoted the formation of more “hot spots”. CNTs@Ag-F-AgNPs were adsorbed on Si-Au substrate via mercapto groups on the coupling agent 1′4 phenyldimercaptan molecule (BDT). Using rhodamine 6G (R6G) as probe molecule, the enhanced factor reached 6.96 × 10 9 . Then, the substrate was used for in-situ SERS detection of transformer oil-dissolved furfural at different concentrations and the detection limit was 2.25 mg/L at 1703 cm −1 (Stretching vibration of C = O in furfural molecule), fulfilling requirements of furfural content detection after severe aging of transformer (4 mg/L). Besides, the relative standard deviation (RSD) of characteristic peak intensity at ten different positions was only 1.74%. These results exhibite that three-dimensional nanostructure with high sensitivity and good reproducibility exhibited a wide application range for in situ detection of dissolved trace furfural in transformer oil.
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