Preparation and Electrocatalytic Performance of Functionalized Copper‐Based Nanoparticles Supported on the Gold Surface

Abstract

Copper nanoparticles (CuNPs) encapsulated by polymeric stabilizer of polyvinylpyrrolidone (PVP) (noted as PVPCuNPs) were simply prepared and used to construct an enzymeless glucose sensor on a solid substrate. Sensing and assay performance of the CuNPs-based sensor to glucose were evaluated in detail. Cyclic voltammetry (CV), chronoamperometry (I -t) and flow injection amperometry (FIA) revealed a high sensitivity, excellent stability, and good reproducibility in the glucose determination at þ 0.45 V, which was 200 mV more negative than those in former reports. A detection limit as low as 1.0 Â 10 À8 M (signal-to-noise ¼ 3) and a linear range of 1.0 Â 10 À7 M to 5.0 Â 10 À3 M were obtained in this study.

Nonenzymatic Electrochemical Glucose Sensor Based on Novel Copper Film

“…The pH effect on glucose electrooxidation was investigated in the study. The oxidation of glucose using NaOH solutions of different concentrations ranging from 0.001 to 1 M and achieved the best response in 0.1 M solution, which was in good agreement with previous reports [31,43,44,46]. So, we selected 0.1 M NaOH as supporting electrolyte.…”

“…The Cu film electrode reached 95 % of the steady-state current within 3s, which is faster than those of 5 s [42,44] in the reports of Cu-based electrode, demonstrating a fast current response of the electrode towards glucose oxidation. , which is much enhanced than that of PVP-functionalized [46] and DMG-functionalized [43] copper nanoparticles sensor, and other enzymeless sensor based on copperbased electrode [44].…”

“…For a high sensitivity, the corresponding potential (+ 0.40 V) of topmost signal-to-background ratio (as shown in Figure 5) was chosen and employed as the optimum constant potential for the determination of glucose [31]. The applied potential of + 0.40 V in the glucose determination in this study was more negative than those of + 0.65 V [41][42][43], 0.55 V [44], 0.50 V [45] and 0.45 V [46] in former reports of copper-based electrode, which suggested a preferable electrocatalytic activity to glucose on this pillar-like-structure Cu film electrode. The pH effect on glucose electrooxidation was investigated in the study.…”

Hierarchical CuO nanochains: Synthesis and their electrocatalytic determination of nitrite

“…However, considering the high cost and limited reserves, now transition metal or their compounds are choosen as sound alternatives for scaled up commercial applications [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. For example, copper based materials, such as copper bulk metal [12], copper nanoparticles [13,14], copper alloys [15] and copper complexes [16], have been proved highly active for electrochemical oxidation/reduction of carbohydrates [13], alcohols [15], amino acids/peptides [17], cyanide and nitrite [18]. Hereinto, copper oxides catalysts show advantages such as low cost, stability, as well as the absence of any oxygen limitation, which are helpful for the development of next generation electrochemical biosensors.…”

“…However, in contrast with the synthesis and catalytic application of Cu [12][13][14]17] and Cu 2 O [18,19], reports on the preparation of hierarchically nanostructured CuO are rather rare, and little attention has been paid to their sensing performance related the mode of assembly. Meanwhile, inorganic catalysts often suffered from the very low surface area, structural collapse, and the as resulted poor catalytic efficiency [20].…”