MICROCHEMICAL JOURNAL
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2023
·
IF 4.8
Wen-Juan Gong,Hua-Rui Nan,Hong-Bo Peng,You-Qun Wang,Zhi-Min Dong,Zhi-Bin Zhang,Xiao-Hong Cao,Yun-Hai Liu
In this study, we prepared a new ratiometric fluorescent sensor by first encapsulating blue-fluorescent carbon dots (B-CDs) with SiO 2 , coupling gold nanoclusters (GSH-AuNCs) to the surface, and finally anchoring a layer of Ag + . The presence of UO 2 2+ caused fluorescence quenching of the ratiometric fluorescent probe when used in aqueous solutions. Furthermore, HOMO–LUMO orbital analysis suggested that the quenching mechanism was mainly attributed to photoinduced electron transfer (PET) between B-CDs@SiO 2 @GSH-AuNCs/Ag + and UO 2 2+ . Under optimal conditions, the ratiometric fluorescent probes exhibited excellent selectivity and detected UO 2 2+ at 37 nmol/L. This new “on–off” ratiometric fluorescent sensor exhibits promising potential for convenient monitoring of UO 2 2+ levels with ideal recovery in real-world water samples.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Dechan Lu,Rongyuan Cai,Yuqin Liao,Ruiyun You,Yudong Lu
Abnormal uric acid (UA) content in body fluids can fully reflect the status of metabolism and immunity in the body. We have developed a simple, efficient and label-free surface enhanced Raman scattering (SERS) method for UA detection. Briefly, p-aminothiophenol (p-ATP) was used as the internal standard molecule and linking molecule to prepare a glass/p-ATP/Ag NPs SERS substrate. The Raman characteristic peak of p-ATP at 1076 cm −1 can be used as an internal standard molecule to correct the signal fluctuation of UA detection. The results show that the SERS method owns a linear response with a ranging from 5 × 10 -6 to 10 -3 M of UA characteristic peak of both 693 cm −1 and 493 cm −1 with a determination coefficient (R 2 ) of 0.9878 and 0.9649, respectively. Additionally, the SERS sensor has been further used for the analysis of UA in sweat and good recoveries were obtained for the sensing of sweat. We believe that the developed SERS substrate has potential for applications in healthcare monitoring.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Jiaqi Hu,Fangyuan Chen,Jie Mao,Linjie Ni,Jinfeng Lu
Molecular oxygen activation is essential to the photocatalytic oxidation reaction, which is highly dependent on the construction of active sites and efficient charge transfer of photocatalysts. In this study, we constructed Bi 4 V 2 O 11 /Ag/AgCl Z-type heterojunction photocatalysts with significantly enhanced molecular oxygen activation capacity. The systematic characterization and analysis including X-ray photoelectron spectroscopy (XPS) and density functional theory (DFT) calculations confirmed that the formation of efficient Z-type heterostructure could be attributed to the introduction of Ag nanoparticles (NPs), which regulated the electron transfer direction from Bi 4 V 2 O 11 to AgCl. Owing to the advantage of enhanced charge transfer efficiency, the O 2 − generation capacity of Bi 4 V 2 O11/Ag/AgCl Z-scheme heterojunction was as high as 4.6 times that of pure Bi 4 V 2 O 11 . Consequently, Bi 4 V 2 O 11 /Ag/AgCl showed good degradation performance against tetracycline (TC), ciprofloxacin (CIP), ranitidine hydrochloride (RAN) and 2,4-dichlorophenoxyacetic acid (2,4-D) under visible light, and their degradation rates were 8.2 times, 5.9 times, 3.8 times and 11.9 times higher than those of Bi 4 V 2 O 11 , respectively. This study provides an effective and feasible strategy to design photocatalyst with improved molecular oxygen activation efficiency.
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Journal of Inorganic and Organometallic Polymers and Materials
·
2023
·Vol. 33
·期 8
·2562-2573
·
IF 4
Jiang Wenjie,Xu Qianrui,Bu Fengjie,Wei Yingying,Wang Yang,Wang Zhifei,Jiang Yong
In recent decades, magnetic nanomaterials with fast separation and recyclable performance have raised great interest for broad applications in catalysis, protein separation and immunodiagnostics. In this paper, Fe 3 O 4 nanoparticles with a size of (350 ± 50) nm were produced by the solvothermal method. Then, the nanoparticles were coated with a shell made of 3-aminophenol-formaldehyde (APF) resin to prevent agglomeration. The reaction was very rapid, and core–shell Fe 3 O 4 @APF nanospheres were produced by polycondensation within 10 min. Besides, the thickness of the APF shell could be easily adjusted in the range of 10–200 nm by controlling the reaction time and the concentration of 3-aminophenol and formaldehyde. In particular, the APF layer could also act as an effective carrier and reducing agent to capture hundreds of well-dispersed Ag nanoparticles for the abundant hydroxyl groups, obtaining sesame-ball-like Fe 3 O 4 @APF@Ag nanocomposites. The structure of sesame-ball can prevent silver nanoparticles from agglomerating, and Fe 3 O 4 core could provide strong magnetism. The magnetic Fe 3 O 4 @APF@Ag nanomaterials could catalyze the reduction of organic dyes (4-NP, MB and RhB), and the catalyst possessed high activity, with the conversion of dyes remaining above 90% within 3 min after 7 cycles.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Hui-fang Du,Jian Zhu,Guo-jun Weng,Jian-jun Li,Xin Li,Jun-wu Zhao
Ligand-mediated interface control has been broadly applied as a powerful tool in constructing asymmetric multicomponent nanoparticles (AMNP), and induces the anisotropic growth with fine-tuning morphology, composition, plasmonic property and functionality. As a new kind of AMNP, the synthesis of Janus Au-Ag nanoparticles with tunable negative surface curvature is still a challenge. Here, we demonstrate that the synergistic surface energy effects between gold nanodumbbells (Au NDs) with a negative surface curvature and 4-mercaptobenzoic acid (4-MBA) can direct the site-selective growth of anisotropic silver domains on gold nanodumbbells (Au NDs@Ag NPs). By adjusting the 4-MBA concentration-dependent interfacial energy, the Au NDs@Ag NPs could be continuously tuned from dumbbell-like core–shell structures, to L-shaped Janus, and then rod-like core–shell structures with directional and asymmetric spatial distributions of resizable Ag domains by site-selective growth. Based on the calculation results of discrete dipole approximation (DDA) method, it has been found that the Au NDs@Ag L-shaped Janus NPs with Ag island domains created polarization orientation-dependent plasmonic extinction spectra and hot spots around the negatively curved waist and Ag domains. The L-shaped Janus Au NDs@Ag NPs exhibited significantly plasmonic spectrum properties with four apparent LSPR peaks that cover from visible to near-infrared range and higher surface-enhanced Raman scattering (SERS) activity compared with the original Au NDs. The best SERS enhancement factor of 1.41 × 10 7 was achieved. This synergistic surface energy effect-based method involving the asymmetric growth of silver coating on gold nanoparticles with negatively curved surface presents a new method to design and fabricate nanometer optical devices based on asymmetric multicomponent nanoparticles.
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TALANTA
·
2023
·
IF 6.1
Peng Jin,Wenlong Tan,Xu Li,Jinsong Fan,Kun Li
Iodine intake remains a major public health concern, as both iodine excess and deficiency are related to adverse effects on health. Therefore, developing simple and economical methods to detect I − is still in great demand. Herein, we constructed a visual I − sensing platform based on the uncoated Ag–Ti 3 C 2 nanohybrids using methyl orange (MO) as a colorimetric indicator . Plasmonic nanostructures are frequently employed in colorimetric analysis , but uncoated Ag nanoparticles (NPs) are unstable because their surface energies are usually high. Considering that Ag NPs can be etched by I − via forming Ag–I bond, we introduce Ag–Ti 3 C 2 nanohybrids because uncoated Ag NPs with immaculate surfaces are more conducive to binding with I − and being etched. Dissolved O 2 molecules adsorbed on Ti 3+ of Ti 3 C 2 MXenes enable the in situ generation of H 2 O 2 by iodine-etching of uncoated Ag–Ti 3 C 2 nanohybrids. ∙OH radicals promote the degradation of MO through a self-driven Fenton-like process, exhibiting the color variation from orange to transparent. Under optimal conditions, the absorbance of MO at 465 nm decreases linearly with the concentration of I − in the range of 0.5–300 μM, with a limit of detection as low as 0.31 μM. This work opens the feasibility of iodine-etching of Ag in developing novel probes for facile colorimetric determination of I − .
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Xiaoyu Zhong,Linyang Li,Wenhao Xiang,Chuanbao Xiao,Nianbing Zhong,Quanhua Xie,Dengjie Zhong,Yunlan Xu,Haixing Chang,Shih-Hsin Ho
Herein, a highly stable and efficient photoelectrocatalytic system was developed for the rapid degradation of tetracycline . The photoelectrocatalytic system comprised two Ag/N-doped TiO 2 nanotube photoanodes, a bipolar membrane, and a P–Pd cathode. The Ag/N-doped TiO 2 nanotube photoanodes were coupled with a P–Pd cathode to enhance the hydroxyl free radical (·OH) generation at the cathode surface. The bipolar membrane can separate tetracycline pollutants and degradation products from the photoanodes, which can minimize the contamination of the photocatalyst by tetracycline or products, thereby enhancing the repeatability and stability of the photoelectrocatalytic system. photoelectrocatalytic uses ultraviolet–visible light as the input energy for the effective removal of tetracycline and total organic carbon . The initial pH in the cathode and photoanode chambers was 7.0. The Na 2 SO 4 concentration in the photoanode chamber and the addition amount of H 2 O 2 were 0.2 M and 4% (v/v), respectively. Under these conditions, 100 mL of 100 mg/L tetracycline was completely degraded within 60 min, and 82.3% total organic carbon was removed within 5 h. The pseudo-first-order reaction rate constant of the Ag/N-doped TiO 2 nanotube with 0.15 M Ag was 0.0637 min-1, which was 12 times higher than that of N-doped TiO 2 nanotube. The mechanisms underlying·OH generation and the tetracycline degradation pathway were also elucidated. The photoelectrocatalytic system, which is an eco-friendly and low-energy system, exhibits excellent stability and reliability toward tetracycline and total organic carbon degradation and significantly aids the development of wastewater remediation.
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ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 33
·期 5
·2210997
·
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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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
·
2022
·
IF 4.831
Xuejiao Wang,Xupeng Zhu,Yufeng Tao,Erjin Zhang,Xudong Ren
Pesticide residues threaten the ecological environment and human health. Therefore, developing high performance SERS substrate to achieve highly sensitive detection of pesticide residues is meaningful. In this study, based on the strategy of combining “hot spots” engineering and material hybridization, we construct a novel hybrid SERS substrate by depositing Ag nanoflowers (NFs) on ZnO nanorods (NRs). Benefiting from the synergistic effect of electromagnetic enhancement and charge transfer effect, the Ag NFs@ZnO NRs substrate exhibits a low detection limit (10 −13 M) for crystal violet molecules. This SERS substrate has good uniformity with a relative standard deviation of 7.463 %. Besides, owning to the photocatalytic property of ZnO NRs, the hybrid substrate can degrade probe molecules after SERS detection and realize recyclability. As a demonstration, we employed our SERS substrate for the trace detection of pesticide residues on apple surface and in river water. This study provides a new idea for improving the SERS performance of hybrid substrates.
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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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INORGANIC CHEMISTRY COMMUNICATIONS
·
2023
·
IF 3.8
Xiang Luo,Xunyi Zhou,Song Wei
Inorganic quantum dot films possess outstanding optical and electrical properties, which are promising in the fields of temperature sensors, thin film transistors, photodetectors, and quantum dot light-emitting diodes (QLEDs). In this paper, high-performance Ag-doped Zn x Cd 1−x S quantum dot films with full-color emission were prepared by a facile and environmentally friendly ionic liquid-assisted approach successfully. The ionic liquid solvent which plays a critical role in the preparation process was formed by the addition of n-butylammonium and n-butylamine in methanol. The n-butylammonium butyrate ionic liquid is low-temperature thermally degradable and can be easily removed from the final quantum dot films by a sintering process. The emitting color of Ag-doped Zn x Cd 1−x S quantum dot films can be easily tuned by changing the contents of Ag, Zn, and Cd in the films. The final as-prepared Ag-doped Zn x Cd 1−x S quantum dot films exhibit the high performance of full-color emission, simple process, and low preparation cost. This work will provide a new strategy to prepare high-performance photoelectric devices with a facile ionic liquid-assisted green solution approach.
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