TEMPO-Functionalized Nanoporous Au Nanocomposite for the Electrochemical Detection of H2O2

<div>(a) CVs of different GCE under the absence (A and B) and presence (C and D) of 5mM H2O2 in N2-saturated 0.1 M PBS (pH = 7.0) at a scan rate of 50mVs<svg height="11.6047pt" id="M23" style="vertical-align:-0.04979992pt" version="1.1" viewbox="-0.0498162 -11.5549 6.93682 11.6047" width="6.93682pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><g transform="matrix(.0091,0,0,-0.0091,0,-5.741)"><path d="M300 253H71L57 198H286L300 253Z" id="g190-46"></path></g><g transform="matrix(.0091,0,0,-0.0091,3.24,-5.741)"><path d="M311 0V25C221 32 216 41 216 113V635C162 613 103 594 39 583V559L88 556C131 552 135 546 135 500V113C135 41 131 32 40 25V0H311Z" id="g190-213"></path></g></svg>. (A) Bare GCE (B and C) np-AuNPs/GCE, and (D) 4-carboxy-TEMPO-np-AuNPs/GCE. Optimization of experimental conditions: (b) CVs of the TEMPO -np-AuNPs/GCE in different pH values at the range of 2.0~9.0 and (c) the relationship between the net current at 0.95V with different pH. (d) CVs of TEMPO-np-AuNPs/GCE in 0.1 M PBS (pH = 7.0), in the presence 5 mM H2O2, in different times from 0 min to 60 min, N2-saturated, 50mVs<svg height="11.6047pt" id="M24" style="vertical-align:-0.04979992pt" version="1.1" viewbox="-0.0498162 -11.5549 6.93682 11.6047" width="6.93682pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><g transform="matrix(.0091,0,0,-0.0091,0,-5.741)"><path d="M300 253H71L57 198H286L300 253Z" id="g190-46"></path></g><g transform="matrix(.0091,0,0,-0.0091,3.24,-5.741)"><path d="M311 0V25C221 32 216 41 216 113V635C162 613 103 594 39 583V559L88 556C131 552 135 546 135 500V113C135 41 131 32 40 25V0H311Z" id="g190-213"></path></g></svg>. Inset: the changes of the electric current (1.6 V) with the time increasing.</div>

International Journal of Analytical Chemistry

fig5

Figure 5

Figure 5: TEMPO-Functionalized Nanoporous Au Nanocomposite for the Electrochemical Detection of H2O2