Ni-MOFs grown on carbonized loofah sponge for electrochemical glucose detection: Effects of different carboxylic acid ligands and reaction temperatures on electrochemical performance

Facile and sensitive detection of glucose level is of great importance in daily life. In recent years, Metal–organic frameworks (MOFs) are often used as modification materials for electrochemical sensors because of their adjustable structure and rich adsorption sites. This work innovatively combines carbonized loofah sponge (CLS) with Ni-MOFs to enhance the conductivity of composite materials. And comparative experiments are conducted to study the effects of different carboxylic acid ligands and synthesis temperatures on the electrochemical sensing performance of the composite material. Through structural and morphology characterizations including SEM, EDS, FTIR, XRD and XPS, and electrochemical performance testings such as CV, EIS and i-t curves, an efficient and sensitive glucose electrochemical sensor of CLS/Ni-MOF (H2BDC)-150 was ultimately constructed. Its minimum detection limit is 0.4 μM. The linear range is 4 μM-2.238 mM, with a sensitivity of 0.8 mA cm−2 mM−1.