Picomolar level electrochemical detection of hydroquinone, catechol and resorcinol simultaneously using a MoS nano-flower decorated graphene.

Herein, a graphene-nano-molybdenum disulphide (pGr-MoS), synthesized from pulverized graphite and using precursors of MoS, was investigated for the electrochemical sensing of dihydroxy benzene isomers (DHBI): hydroquinone (HQ), catechol (CA), and resorcinol (RE). Interestingly, the material could sense the three isomers simultaneously, with well-defined peaks and an adequate potential difference between each peak. The detection limits (3 method) of HQ, CA, and RE on the glassy carbon electrode (GCE) modified with pGr-MoS are 10, 10, and 10 M (, 0.

A highly stable copper nano cluster on nitrogen-doped graphene quantum dots for the simultaneous electrochemical sensing of dopamine, serotonin, and nicotine: a possible addiction scrutinizing strategy.

A highly stable copper (Cu) nanocluster (NC), which exhibited stability for more than one year, was synthesized using nitrogen-doped graphene quantum dots (N-GQDs) as reducing and capping agents and smaller glutathione molecules as additional capping agents. The synthesized NC, CuNC@N-GQDs, successfully sensed dopamine (DA), serotonin (SER), and nicotine (NIC) simultaneously with well-defined peaks and good peak-to-peak separation, whereas none of the controls including CuNCs and N-GQDs exhibited the simultaneous sensing properties. In addition, they exhibited enhanced sensitivity with current responses ∼4, ∼4, and ∼2 times those of the corresponding control for DA, SER, and NIC.