In situ synthesis of gold nanoparticle on MIL-101(Cr)-NH2 for non-enzymatic dopamine sensing

In this paper, MIL-101(Cr)-NH2 was firstly prepared hydrothermally, and then the Au/MIL-101(Cr)-NH2 composites were synthesized by in-situ growth of highly dispersed Au through electrostatic interaction. Moreover, a DA electrochemical sensing method was established based on Au/MIL-101(Cr)-NH2. The morphologies and structure of the sensor material were researched by scanning electron microscopy, transmission electron microscopy, X-ray powder diffractometer, infrared spectrometer, and N-2 adsorption-desorption, which proved that the Au nanoparticles were uniformly distributed on porous MIL-101(Cr)-NH2. Electrochemical studies indicated that the established DA electrochemical sensing method based on Au/MIL-101(Cr)-NH2/GCE had a satisfactory detection limit of 9.6 nmol.L-1, the linear range was 0.3-288.8 mu mol.L-1, and the sensitivity was 251.6 mu A (mmol.L-1)(-1) cm(-2). These results demonstrated that Au/MIL-101(Cr)-NH2 is an effective electrochemical sensing modification material.

Automated summary

In this paper, MIL-101(Cr)-NH2 was prepared hydrothermally and Au/MIL-101(Cr)-NH2 composites were synthesized through in-situ growth of Au nanoparticles. A DA electrochemical sensing method was established based on Au/MIL-101(Cr)-NH2. The results showed that Au/MIL-101(Cr)-NH2 is an effective electrochemical sensing material.