YangTao Yuan,ZhengXian Zhou,XuDong Hao,JiaJia Mi,Yu Cao,JianPing Shi
Surface-enhanced Raman scattering (SERS) is a spectroscopic technique that utilizes nanostructured substrates and is vital in food analysis. However, enhancing SERS substrates' sensitivity and applicability remains a challenge. The conductive metal organic framework Ni3(HHTP)2 has been widely used due to its excellent conductivity and porous structure. This study combines Ni3(HHTP)2's charge transfer properties with AgNPs's localized surface plasmon resonance to create a highly sensitive SERS substrate. Firstly, rod-shaped Ni3(HHTP)2 was prepared, and then a monolayer of AgNPs film was loaded on its surface. The substrate can detect crystal violet at a concentration of 10−14 M, and Ni3(HHTP)2 has a flat structure, coupled with AgNPs film, provided good detection uniformity (Relative Standard Deviation, RSD = 10.09%). Moreover, the substrate successfully detected food additives solutions, as well as the pesticide residues on fruit surfaces by bending. This substrate offers a rapid monitoring solution for food safety, facilitating real-time detection of contaminants in daily life.
In this work, one-dimensional (1D) conductive MOFs Ni 3 (HHTP) 2 with nanorod-like morphology on the surface of a woven fabric was synthesized by an in-situ growth method. Based on a three-electrode system, the effects of substrate concentration, scan rate and current density on electrode properties were investigated, respectively. The results showed that Ni 3 (HHTP) 2 @ woven fabric-3 (NHWF-3) demonstrated the largest area capacitance at 5 mV s −1 and reached up to 360 μF cm −2 at 20 μA cm −2 . Most importantly, the material still maintained 58.3% (210 μF cm −2 ) of the initially areal specific capacitance when the current density was increased 5 times to 100 μA cm −2 . According to the electrochemical impedance spectroscopy (EIS) curve, NHWF-3 has the smallest semicircle radius in the high-frequency region, indicating that it has the lowest internal transfer resistance and the best conductivity. Thus, this study provides a good example for the simple preparation and practical applications of conductive MOFs composites.
危险品化学品经营许可证（带存储）