SENSORS AND ACTUATORS B-CHEMICAL
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2020
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IF 7.1
Qinzhi Wang,Zhihao Xu,Yijian Zhao,Hui Zhangsun,Tong Bu,Changqiu Zhang,Xin Wang,Li Wang
Surface-enhanced Raman scattering (SERS) enables azo dye monitoring become rapid and efficient. However, the high cost, low efficiency and poor recyclability of SERS substrate limit its practical application. Herein, we propose a facile strategy to develop self-cleaning carbon cloth as a high-performance and reusable SERS substrate through in-situ growth of leaf-like metal-organic framework (L-MOF) and one-step electro-deposition of flower-like Ag nanoparticles (CC-L-MOF@F-Ag) followed by chemical modification for SERS detection of congo red (CR), chrysoidine (CYD) and acid orange II (AO II) in soft drinks. Taking advantages of superhydrophobicity and SERS-active F-Ag, the prepared self-cleaning CC-L-MOF@F-Ag not only avoids the diffusion-random problem and further boosts sensitivity, but also yields excellent self-cleaning property through facile washing with water, endowing its good reusability and stability. Furthermore, this substrate can realize quantitative detection of CR, CYD and AO II with low limits of detection (0.013 μM for CR, 0.017 μM for CYD and 0.0067 μM for AO II) and wide linear detection range (0.1 – 1000 μM for CR, 0.1 – 1000 μM for CYD and 0.01 – 100 μM for AO II). Meanwhile, CR, CYD and AO II in six soft drinks were also successfully detected with satisfactory recoveries. This method provides a potential and cost-effective strategy to develop advanced SERS sensing device for effective monitoring azo dyes in soft drinks.
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CHINESE JOURNAL OF CATALYSIS
·
2025
·
IF 17.7
Hong-Rui Zhu,Xi-Lun Wang,Juan-Juan Zhao,Meng-Han Yin,Hui-Min Xu,Gao-Ren Li
Plastics are ubiquitous in human life and pose certain hazards to the environment and human body. The increasing amount of CO 2 in the atmosphere will lead to the greenhouse effect. Therefore, it is urgent to treat microplastic waste and CO 2 by using environmentally friendly and efficient technologies. In this work, we developed an efficient photoelectrocatalytic system composed of Ni single atoms (Ni SAs) supported by P, N-doped amorphous NiFe 2 O 4 (Ni SAs/A-P-N-NFO) as anode and Ag nanoparticles (Ag NPs) supported by CuO/Cu 2 O nanocubes (Ag NPs@CuO/Cu 2 O NCs) as cathode for microplastic oxidation and CO 2 reduction. The Ni SAs/A-P-N-NFO was synthesized by calcination-H 2 reduction method, and it achieved a Faraday efficiency of 93% for the oxidation reaction of poly (ethylene terephthalate) (PET) solution under AM 1.5 G light. As a photocathode, the synthesized Ag NPs@CuO/Cu 2 O NCs was utilized to reduce CO 2 to ethylene and CO at 1.5 V vs . RHE with selectivity of 42% and 55%, respectively. This work shows that the photoelectrocatalysis, as an environmentally friendly technology, is a feasible strategy for reducing the environmental and biological hazards of light plastics, as well as for efficient CO 2 reduction.
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TALANTA
·
2026
·
IF 6.7
Kaiyuan Zhang,Lian Xia,Jiazhen Shi,Han Tao,Jianli Zhou,Yuangen Wu
A new Ag/Cu metal-organic nanozyme with MOF-like features was developed. • Dual ligands and Ag/Cu co-incorporation enable dual enzyme-mimicking activities. • “Kill two birds with one stone”: one nanozyme discriminates Cr(III) and Cr(VI). • Orthogonal channels allow direct Cr(III)/Cr(VI) quantification without subtraction. • Smartphone-assisted analysis enables chromium speciation in river water. Chromium predominantly exists as Cr(III) and Cr(VI) in aquatic environments, which differ markedly in physicochemical properties and toxicity. Rapid and direct discrimination of Cr(III) and Cr(VI) remains challenging because conventional chromium speciation methods often require redox pretreatment, multiple recognition elements, or indirect calculation. Herein, a new Ag/Cu-containing metal-organic nanozyme with MOF-like structural characteristics (Ag-BC@Cu) was developed. Ag-BC@Cu exhibited laccase-like and peroxidase-like activities and was used to construct an orthogonal colorimetric sensor for discrimination of Cr(III) and Cr(VI). Cr(III) selectively inhibited the laccase-like pathway, whereas Cr(VI) enhanced the peroxidase-like pathway, producing independent colorimetric responses at 510 and 652 nm, respectively. Generally, both chromium species were directly discriminated and quantified using a single nanozyme without redox pretreatment, multiple probes, or subtraction-based calculations. The detection limits of the orthogonal colorimetric sensor were 0.05 mg·L -1 for Cr(III) and 0.0047 mg·L -1 for Cr(VI). Smartphone-assisted analysis further enabled portable visual detection of chromium speciation. The colorimetric sensor exhibited good selectivity and was successfully applied to river-water samples, with results consistent with LC-ICP-MS. This work provides a simple “kill two birds with one stone” strategy for chromium speciation, with potential for portable water-quality monitoring. A dual enzyme-mimicking Ag-BC@Cu nanozyme enabled the orthogonal colorimetric detection of Cr(III) and Cr(VI). Cr(III) selectively inhibited the laccase-like activity, whereas Cr(VI) enhanced the peroxidase-like activity, enabling successful application to river-water samples. Download: Download high-res image (297KB) Download: Download full-size image
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Fangfei Chen,Chaoyue Wu,Jinnan Wang,Corvini Philippe François-Xavier,Thomas Wintgens
To improve the visible-light photocatalytic activity and photo-carriers separation of BiVO 4 , highly efficient Z-scheme structured visible-light photocatalyst Ag@AgBr/BiVO 4 /Co 3 O 4 was constructed by selective doping of Ag@AgBr and Co 3 O 4 on {010} and {110} facets of BiVO 4 . Due to the different energy levels of conduction band (CB) and valence band (VB) between {010} facet and {110} facet, BiVO 4 could act as the ‘pre-separation channel’ to achieve spatial charge separation. Such pre-separation channel effect improved photo-electrons transfer from BiVO 4 {010} facets to electron mediator (Ag°) for subsequent recombination with holes of AgBr. Thus, the photo-induced electrons of AgBr could be accumulated on CB for reduction of O 2 to O 2 − . On the other hand, holes of BiVO 4 accumulated on {110} facets were captured by deriving-hole-type co-catalysts Co 3 O 4 for organics oxidation. In addition, Ag° not only served as the electron mediator of Z-scheme but also improve the visible-light utilization due to SPR-effect. Being attributed to the synergistic effect of pre-separation channel and deriving-hole-type co-catalysts, Z-scheme structured Ag@AgBr/BiVO 4 /Co 3 O 4 (0.15 wt%) achieved high photodegradation rate of organics. Even after 9th cycles, Ag@AgBr/BiVO 4 /Co 3 O 4 (0.15 wt%) could still photodegraded more than 90% of OTC within 24 min. DRS, PL and photoelectrochemical analyses also confirmed the improvement of visible-light utilization and charge separation of Ag@AgBr/BiVO 4 /Co 3 O 4 . The radical trapping experiments and EPR demonstrated that both superoxide radical ( O 2 − ) and holes (h + ) were main active species for organics photodegradation. In summary, this work not only constructed a highly efficient Z-scheme structured visible-light photocatalyst, but also provided a new method to diminish the photo-carriers recombination by pre-separation channel and hole-sink effects.
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Min Liu,Jing Jiang,Dalun Xu,Leiwen Xiang,Huawei Wu,Tao Jiang,Jinjie Zhang
The production and distribution of 2,5-dimethylpyrazine (2,5-DMP), a key volatile flavor compound, are associated with the frying of skipjack tuna steaks. In this study, an intestinal villus-like chip was fabricated to quantitatively detect 2,5-DMP in multiphase systems based on surface-enhanced Raman spectroscopy (SERS). The chip exhibited excellent SERS performance with an enhancement factor of 1.16 × 10 8 , excellent uniformity and reproducibility, and low detection limits of 6.49 pg/mL, 0.182, and 0.920 ng/mL for 2,5-DMP solid, liquid, and gas models, respectively. The results indicated the 2,5-DMP content with growth rates in the order of frying steam > frying steaks > frying oil, and the 2,5-DMP content in frying steam was linearly correlated (R 2 = 0.992) with the trend of the acid value and total polar compounds in frying oil. Therefore, this strategy for achieving the reliable detection of 2,5-DMP can assist in monitoring the frying process and food safety.
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高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2024
·Vol. 416
·期 10
·2515-2525
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IF 3.8
Peng Ruiying,Qi Wenchen,Deng Ting,Si Yanmei,Li Jishan
The ultrasensitive detection of hepatitis C virus (HCV) nucleic acid is crucial for the early diagnosis of hepatitis C. In this study, by combining Ag@Au core/shell nanoparticle (Ag@AuNP)-based surface-enhanced Raman scattering (SERS) tag with hybridization chain reaction (HCR), a novel SERS-sensing method was developed for the ultrasensitive detection of HCV nucleic acid. This SERS-sensing system comprised two different SERS tags, which were constructed by modifying Ag@AuNP with a Raman reporter molecule of 4-ethynylbezaldehyde, two different hairpin-structured HCR sequences (H1 or H2), and a detection plate prepared by immobilizing a capture DNA sequence onto the Ag@AuNP layer surface of the detection wells. When the target nucleic acid was present, the two SERS tags were captured on the surface of the Ag@AuNP-coated detection well to generate many “hot spots” through HCR, forming a strong SERS signal and realizing the ultrasensitive detection of the target HCV nucleic acid. The limit of detection of the SERS-sensing method for HCV nucleic acid was 0.47 fM, and the linear range was from 1 to 10 5 fM. Graphical
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JOURNAL OF NANOBIOTECHNOLOGY
·
2018
·Vol. 16
·期 1
·1-10
·
IF 5.294
Wang Shuai,Qu Fei,Han Wenli,You Jinmao
Background Differentiation of telomere length is of vital importance because telomere length is closely related with several deadly diseases such as cancer. Additionally, G-quadruplex and i-motif formation in telomeric DNA have been shown to act as a negative regulator of telomere elongation by telomerase in vivo and are considered as an attractive drug target for cancer chemotherapy. Results In this assay, Ag nanoclusters templated by hyperbranched polyethyleneimine (PEI–Ag NCs) are designed as a new novel resonance Rayleigh scattering (RRS) probe for sensitive differentiation of telomere length and monitoring special motifs (G-quadruplex and i-motif). In this assay, free PEI–Ag NC probe or DNA sequence alone emits low intensities of RRS, while the formation of PEI–Ag NCs/DNA complexes yields greatly enhanced RRS signals; however, when PEI–Ag NCs react with G-quadruplex or i-motif, the intensities of RRS exhibit slight changes. At the same concentration, the enhancement of RRS signal is directly proportional to the length of telomere, and the sensitivity of 64 bases is the highest with the linear range of 0.3–50 nM (limit of detection 0.12 nM). On the other hand, due to the conversion of telomere DNA molecules among multiple surrounding conditions, a DNA logic gate is developed on the basis of two chemical input signals (K + and H + ) and a change in RRS intensity as the output signal. Conclusion Our results indicate that PEI–Ag NCs can serve as a novel RRS probe to identify DNA length and monitor G-quadruplex/i-motif through the different increasing degrees of RRS intensity. Meanwhile, the novel attributes of the nanoprobe stand superior to those involving dyes or labeled DNA because of no chemical modification, low cost, green, and high efficiency.
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ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Mengxue Wang,Lingsha Li,Haipeng Yan,Yong You,Xiaohong He,Zhongxiang Bai,Ying Li,Kui Li,Xulin Yang,Pan Wang
Separating oil-water emulsions in harsh conditions poses a substantial challenge for filtration membrane systems. In response, this study presented a continuous electrospinning technique to fabricate a robust bifacial composite membrane. Two types of high-performance polyarylene ether nitrile (PEN) polymers, PEN-BPA and PEN-B/P, with different wettability, are employed to construct the AB bifacial structure. Further, the A-side is modified with hydrophilic polydopamine (PDA) and antibacterial silver nanoparticles (Ag NPs) to prepare Ag@PDA/PEN-BPA, while the B-side is altered with photocatalytic titanium dioxide nanoparticles (TiO 2 ) to prepare TiO 2 /PEN-B/P. The resulting Ag@PDA/PEN-TiO 2 /PEN-B/P bifacial membrane demonstrates remarkable photocatalytic degradation efficiency, particularly for MB, reaching 99.8% degradation efficiency. Moreover, the permeation flux and oil-water emulsion separation rejection rate of the membrane reach 5180.34 L m − 2 ·h −1 and 99%. The PEN substrates are not only used to construct the AB bifacial structure but also to enhance the membrane's toughness and durability, ensuring stability in high-temperature and corrosive environments, with a rejection rate reaching 99% after 10 reuse cycles. Furthermore, integrating Ag NPs imparts excellent antibacterial properties to the membrane, sustaining a 99.99% antibacterial rate after oil-water emulsion separation, photocatalytic dye degradation, and exposure to high-temperature NaCl immersion. This study offers novel insights into multifunctional water treatment materials in harsh environments.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 44
·期 5
·1777-1784
·
IF 3.069
Yuanjie Teng,Zeyu Ren,Yuchao Zhang,Zhenni Wang,Zaifa Pan,Kang Shao,Yuanbin She
A disposable Ag array@screen-printed electrode (SPE) was fabricated for the identification and analysis of the adsorption behavior of organic carboxylates in in situ electrochemical surface-enhanced Raman scattering (EC-SERS). Liquid–liquid self-assembled Ag arrays were prepared and modified onto the SPE to induce the SERS enhancement effect. The Ag arrays were characterized by transmission electron microscopy and UV-Vis spectroscopy and the SERS performance of the sensor was explored. The adsorption behavior and orientation of citrate, tartrate, and malate on the Ag array@SPEs at controlled potential for appropriate durations were studied. The results showed that citrate, tartrate, and malate can be concentrated on the Ag array@SPE surface with an effective amplification of SERS signals at a potential of 0.100 V vs. Ag/AgCl for 400 s, 450 s and 350 s. Carboxylates were identified on the basis of the vibrational assignments of characteristic SERS bands. Citrate, tartrate and malate adsorbed mainly in claw, parallel and vertical forms on the sensor at controlled potential. Therefore, the Ag array@SPEs have potential applications in the rapid and sensitive determination of these analytes and the identification of intermediates in EC-SERS.
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ANALYTICAL CHEMISTRY
·
2012
·
IF 5.856
Fei Qu,Nian Bing Li,Hong Qun Luo
Ag nanoclusters functioned by hyperbranched polyethyleneimine have been developed as a new fluorescent and colorimetric platform for sensitive and selective recognition of halide ions (e.g., Cl–, Br–, and I–). The recognition mechanism is based on the unique reactions between halide ions and the silver atoms. In particular, halide-induced oxidative etching and aggregation can produce a strong fluorescence quenching of Ag nanoclusters. This sensing system exhibits a remarkably high selectivity toward halide ions over most of anions and cations and shows good linear ranges and lower detection limits: the linear ranges are 0.5–80 μM for Cl–, 0.1–14 μM for Br–, and 0.05–6 μM for I–, respectively; the limits of detection for Cl–, Br–, and I–, at a signal-to-noise ratio of 3, are estimated to be 200, 65, and 40 nM, respectively. Specifically, Br– and I– could be recognized selectively in the coexistence with Cl– under the condition of higher ionic strength, which is a significant advantage in the detection of Br– and I– in real samples. In addition, the recognition of halide could be performed by the colorimetric method, which is also attractive and promising because of its simplicity, rapidity, reliability, and low cost. Furthermore, this sensing system has been applied successfully to the detection of Cl– in real water samples.
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