Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Hongji Li,Dongze Li,Junfu Wang,Haochen Yu,Chengsi Huang,Wei Jiang,Chunbo Liu,Guangbo Che,Dandan Wang
In this work, a novel imprinted sensor based on Ag-modified composite metal organic Frameworks (MOFs) was synthesized for selective detection to Rhodamine B (RhB) in river. UIO-66(NH 2 ) was firstly dispersed on the surface of ZIF-8 with the assistance of PVP, and Ag nanoparticles were dispersed on the surface by in-situ reduction. The ZIF-8/UIO-66(NH 2 )/Ag-MIPs (AZU-MIPs) were synthesized by the process of precipitation polymerization. It was proved from the analysis results that AZU-MIPs presented sensitive and selective detection property to RhB. Furthermore, AZU-MIPs also presented stability and repeatability property during the practical samples detection. There was an obvious linear relationship between concentration and Raman intensity when the concentration of RhB changed between 10 −6 M and 5 × 10 −11 M. The detection of limit (LOD) was 5 × 10 −11 M, and the correlation coefficient (R 2 ) was 0.9984. It could be considered that the novel imprinted sensor presented a promising candidate for Rhodamine B and other organic fluorescent dye detection in the river, and this work also provided an application prospect to the monitor of water environment.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
SENSORS
·
2024
·Vol. 24
·期 2
·474
·
IF 3.4
Wenkai Zhao,Runxiang Tan,Yanping Yang,Haoyong Yang,Jianing Wang,Xiaodong Yin,Daheng Wu,Tao Zhang
Surface-enhanced Raman scattering (SERS) spectroscopy is a powerful technology in trace analysis. However, the wide applications of SERS in practice are limited by the expensive substrate materials and the complicated preparation processes. Here we report a simple and economical galvanic-replacement-assisted synthesis route to prepare Ag nanoparticles on Cu(0) foil (nanoAg@Cu), which can be directly used as SERS substrate. The fabrication process is fast (ca. 10 min) and easily scaled up to centimeters or even larger. In addition, the morphology of the nanoAg@Cu (with Ag particles size from 30 nm to 160 nm) can be adjusted by various additives (e.g., amino-containing ligands). Finally, we show that the as-prepared nanoAg@Cu can be used for SERS characterization of two-dimensional polymers, and ca. 298 times relative enhancement of Raman intensity is achieved. This work offers a simple and economical strategy for the scalable fabrication of silver-based SERS substrate in thin film analysis.
研究领域:
材料科学
·
分析化学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Xiaoming Li,De Zhang,Yufeng Wang,Jie Huang,Qianmin Dong,Shangzhong Jin,Pei Liang
This work proposes the application of multi-residue Surface-enhanced Raman spectroscopy (SERS) detection based on an internal standard and aptamer-functionalized gold nanofilms. First, two types of complementary DNA (cDNA) are fixed on the self-assembled monolayer of a halide ion-regulated nano-membrane through gold-sulfur bonds. Then, two signal probe molecules are prepared and modified. The aptamer specifically binds to cDNA, generating SERS signals. Detection of the target analytes is achieved by measuring the Raman intensity and using the internal standard method. The results show that the concentrations of thiamethoxam and dichlorodiphenyltrichloroethane (DDT) at 10 -12 M can be effectively measured under optimal experimental conditions. The Raman intensity exhibits a linear relationship at the shifts of 1085 cm -1 for 4-mercaptopyridine (4-MPY) and 1583 cm -1 and 2223 cm -1 for 4-mercaptobenzoic acid (4-MBN). When applied to the detection of thiacloprid in actual lake water samples, the results show no significant difference compared to the standard.
研究领域:
分析化学
·
纳米技术
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2019
·
IF 4.916
Yingfen Jiang,Da-Wen Sun,Hongbin Pu,Qingyi Wei
An ultrasensitive method for the kanamycin (KANA) detection in milk sample using surface-enhanced Raman spectroscopy-based aptasensor was employed in the current study. Double strand DNA binding bimetallic [email protected] nanoparticles were developed as a sensing platform. Probe DNAs were first embedded on the surface of gold nanoparticles by the end-modified thiol, and after silver shell encapsulating, KANA aptamer DNAs with the Raman reporter Cy3 were then hybridized with probe DNAs by complementary base pairing. Results showed that with increase in the KANA concentration, the Raman intensity of Cy3 decreased. Besides achieving selectivity , an ultralow detection limit of 0.90 pg/mL, a broad linear relationship ranging from 10 μg/mL to 100 ng/mL in aqueous reagent and satisfactory recoveries of 90.4–112% in liquid whole milk were obtained. The result of actual sample proved that this aptasensor was promising in trace determination of KANA residue.
研究领域:
分析化学
·
食品安全
·
纳米技术
·
生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Yumin Chen,Weiwei Cheng,Yuling Yang,Di Wu,Yan Zhang,Xiaozhi Tang
A versatile Surface-enhanced Raman Spectroscopy (SERS) aptasensor was fabricated for ultrasensitive and stable aflatoxin B1 (AFB1) detection using complementary DNA strands (cDNA) modified Fe 3 O 4 @UiO-66-NH 2 as capture probe and aptamer modified Au@ 4-MBA@AgNPs as signal probe . The surface of the Fe 3 O 4 beads was functionalized with UiO-66-NH 2 to improve the surface area and content of reactive amino groups for stable immobilization of cDNA and capture of more signal probes. Raman tag (4-mercaptobenzoic acid, 4-MBA) embedded Au@AgNPs nanoparticles (Au@4-MBA@AgNPs) was used as signal probes to achieve strong SERS intensity and protect the tag molecules from external interference. When no AFB1 existed, a strong SERS intensity of the signal probe was observed due to the DNA hybridization reaction between the capture and signal probe. While, the addition of AFB1 led to the dissociation of signal probes from the capture probes, leading to a decreased Raman intensity . As a result, a low limit of detection of 1.47 × 10 −7 ng/mL and wide linear range from 10 −6 to 10 2 ng/mL were obtained for determination of AFB1 based on the fabricated aptasensor. Moreover, an excellent selectivity and desirable recoveries from 94.3 % to 103.3 % in real maize samples were obtained, demonstrating the fabricated SERS aptasensor is promising in practical applications.
研究领域:
分析化学
·
食品安全
·
纳米技术
·
光谱学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 32
·期 4
·2106341
·
IF 18.808
Chao Chen,Wu Bin Ying,Jiayi Li,Zhengyang Kong,Fenglong Li,Han Hu,Ying Tian,Do Hwan Kim,Ruoyu Zhang,Jin Zhu
Ionic skin (I-Skin) has the advantage of feasible compatibility with biological systems. Nevertheless, developing a stable and durable ionic skin is challenging. Here, an ionic polyurethane (i-PU) is synthesized, which is capable of self-healing and able to lock the ionic liquids (ILs). In detail, an ionic chain extender containing an ammonium cationic group is synthesized, followed by the polymerization to obtain the target i-PU. Through electrostatic interaction and chain diffusion, the i-PU can be fully self-healed at room temperature within 400 min. Afterward, low contact angle (37°) of the i-PU against IL and the density functional theory (DFT) calculation prove their good compatibility and strong interaction, originating from the electrostatic interaction. The Raman intensity map shows the reversible process of the enrichment and restoration of ionic concentration on the i-PU/IL surface when external pressure is applied or released, proving stable binding of ions by ionic polymer chains. Lastly, the self-healing I-Skin based on the i-PU/IL is fabricated with a wide range of pressures (0–120 kPa), fast response time (32 ms), excellent antifatigue property (2% attenuation after 1000 cycles), and remarkable sensitivity (52.4 kPa –1 ).
研究领域:
材料科学
·
柔性电子学
·
生物界面
·
传感器
·
高分子化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）