부산대학교 도서관

Three-dimensional (3D) metal–organic frameworks (MOFs) a class of porous materials with tunablestructure and surface functionality has arisen as electrode materials especially, for electrochemical sensingof analytes. However, MOFs possess intrinsic drawbacks such as poor conductivity with an agglomerationof particles, which restricted the electrochemical signal response in terms of sensitivity anddetection limits. In this regard, the present work aims to develop conducting Cu-MOF on HNTs, a goodsubstate for in-situ growth of MOF nanostructures due to the existence of abundant negatively chargedSi-OH that can help the growth of nanosized MOFs. The negatively charged siloxane (Si-O-Si) groupson the surface of HNTs can be attracted by positive charged Cu2+ ions present in the reaction mixturethrough strong electrostatic attraction. When subjected to hydrothermal treatment, the Cu2+ ions canform nano-sized Cu-MOF particles with assistance from 2-methylimidazole. Moreover, the presence ofgraphene oxide (GO) can improve the electrical conductivity, large surface area, and thus resulting inthe formation of conducting Cu-MOF/HNTs/rGO nanocomposite. Owing to the synergetic desirable propertiesof active metal sites and high porosity offered by Cu-MOF, the high conductivity of rGO, and thelarge surface area of HNTs, the resultant Cu-MOF/HNTs/rGO modified GC electrode demonstrates superiorelectrochemical signal response towards dopamine and paracetamol. Moreover, the developed sensorexhibits wide linear ranges of 0.1 lM–130 lM and 0.5–250 lM, with a low detection limit of 0.03 lMand 0.15 lM for dopamine and paracetamol, respectively.