Enzyme- and metal-free electrochemical sensor for highly sensitive superoxide anion detection based on nitrogen doped hollow mesoporous carbon spheres

Abstract

Enzyme-and metal-free electrochemical sensor for highly sensitive superoxide anion detection based on nitrogen doped hollow mesoporous carbon spheres, Electrochimica Acta http://dx.

Carbon Nanomaterials for Energy and Biorelated Catalysis: Recent Advances and Looking Forward

“…As unique features, for example, good conductivity, effective N doping, apposite pore size/volume, and large SSA, N-HMCS showed a higher sensitivity for detection of O 2 •– than solid carbon spheres and hollow mesoporous carbon spheres without N doping, even some of metal-/enzyme-based sensors. 181 More recently, microporous graphitic nanosheets with N,P-codoping (N,P-CMP-1000) were fabricated by the pyrolysis of as-prepared conjugated polymers and phytic acid, which was then employed as highly active C-MFC toward overall ORR in a broad pH range. Specifically, having a high electrocatalytic activity for ORR in neutral solution (Figure 10c), N,P-CMP-1000 was successfully used for DO electrochemical quantification with a low detection limit of 1.89 μAmg –1 L and wide detection range from 2.56 to 16.65 mg L –1 .…”

“…(a) SEM image of N-HMCS, the inset is the corresponding TEM image. (b) Current–time response on N-HMCS electrode with successive injection of O 2 •– into 0.1 M deoxidized PBS with pH 7.4 at a given potential of −0.15 V. 181 (c) LSV curves of the N,P-CMP-1000 catalyst in common PBS solution (top) and artificial tear (bottom), respectively. Inset: dissolved oxygen (DO) concentrations detected by a commercial DO sensor.…”

Recent Trends on Electrochemical Sensors Based on Ordered Mesoporous Carbon

“…The success of such reactions is easily monitored by surface analysis (using X-ray Photoelectron Spectroscopy, XPS, for example). Bulk functionalization by doping is possible by adding a nitrogen- and/or sulfur-containing dopant in the precursor synthesis medium, but this strategy ( Figure 6 B) has been applied for electroanalytical purposes only very recently (N-doping [ 107 , 108 , 109 , 110 ] or dual N,S-doping [ 111 ]). XPS and Raman spectroscopy are usually used to evidence these additional sites in OMC.…”

“…The electrochemical sensors based on functionalized OMC [ 24 , 26 , 49 , 50 , 106 , 107 , 108 , 109 , 110 , 111 , 112 , 113 , 114 , 115 , 116 , 117 , 118 , 119 , 120 , 121 , 122 , 123 , 124 , 125 , 126 , 127 , 128 , 129 , 130 , 131 , 132 , 133 , 134 , 139 , 140 , 141 , 142 , 143 , 144 , 145 , 146 , 147 , 148 , 149 , 150 , 151 , 152 , 153 , 154 , 155 , 156 , 157 , 158 , 159 ...…”

“…Besides the strategies of OMC surface modification with mediators, another recent approach is the bulk functionalization via N-doping [ 49 , 107 , 108 , 109 , 110 ] (or even N,S dual-doping [ 111 ]) to generate OMC materials containing more catalytically active sites. In the field of electrochemical sensors, they are particularly suited to detection of mixtures (e.g., ascorbic acid, dopamine and uric acid [ 107 , 108 , 109 ] or hydroquinone and catechol [ 111 ]) with well-resolved electrochemical signals attributed to superior electrocatalytic behavior due to increased edge-plane defect sites [ 49 ].…”