Gold nanoparticle–graphene nanohybrid bridged 3-amino-5-mercapto-1,2,4-triazole-functionalized multiwall carbon nanotubes for the simultaneous determination of hydroquinone, catechol, resorcinol and nitrite

摘要

In this report, gold nanoparticlea€“graphene nanohybrids (Aua€“GR) and 3-amino-5-mercapto-1,2,4-triazole-functionalized multiwall carbon nanotubes (MWCNTa€“SH) were synthesized. And a novel hybrid material MWCNTa€“SH@Aua€“GR was obtained by the interaction between gold nanoparticles of two dimensional (2D) Aua€“GR and SH groups of 1D MWCNTa€“SH. Due to the synergistic effects between MWCNTa€“SH and Aua€“GR and excellent film forming ability of MWCNTa€“SH@Aua€“GR, the obtained MWCNTa€“SH@Aua€“GR was used as a modifier to fabricate a chemically modified electrode for the simultaneous determination of hydroquinone (HQ), catechol (CC), resorcinol (RC) and nitrite (NO2a?’). Scanning electron microscopy (SEM) was employed to characterize the morphology of MWCNTa€“SH@Aua€“GR. The electrochemical behavior of the sensor was investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV) techniques. Results showed that it was feasible to simultaneously measure HQ, CC, RC and NO2a?’. The linear response ranges for HQ, CC, RC and NO2a?’ were 54.5a€“1250.5 ??M, 11.0a€“126.0 ??M, 43.5a€“778.5 ??M and 86.0a€“7500.0 ??M and the detection limits (S/N = 3) were 4.17 ??M, 1.00 ??M, 7.80 ??M and 23.5 ??M, respectively.