Silver Oxide Nanowalls Grown on Cu Substrate as an Enzymeless Glucose Sensor

Abstract

Ag(2)O nanowalls consisting of densely packed nanoplates based on a Cu substrate were synthesized through a facile one-pot hydrothermal method. A new enzymeless glucose sensor of Cu-Ag(2)O nanowalls was fabricated. The Cu-Ag(2)O nanowalls showed higher catalysis on glucose oxidation than traditional Ag(2)O nanoflowers and Cu-Ag(2)O nanospindles. At an applied potential of 0.4 V, the sensor produced an ultrahigh sensitivity to glucose (GO) of 298.2 microA mM(-1). Linear response was obtained over a concentration range from 0.2 mM to 3.2 mM with a detection limit of 0.01 mM (S/N = 3). Satisfyingly, the Cu-Ag(2)O nanowalls modified electrode was not only successfully employed to eliminate the interferences from uric acid (UA) acid ascorbic (AA) and also fructose (FO) during the catalytic oxidation of glucose. The Cu-Ag(2)O nanowalls modified electrode allows highly sensitive, excellently selective, stable, and fast amperometric sensing of glucose and thus is promising for the future development of nonenzymatic glucose sensors.

Electronic structures of silver oxides

“…Both Ag 2 O and AgO have uses in battery technologies [16][17][18][19] and antibacterial applications. [20][21][22] Ag 2 O is also used in molecular sensor technologies, 23 for example, as an enzymeless glucose sensor with Cu, 23,24 water splitting, 25 optical memories, 26 and organic catalysis, for example, in transmetalation 27 and the oxidation of aldehydes by molecular oxygen. 28 Additionally, Ag 2 O is used as a component of a range of fast-ion conducting glasses of the form AgIAg 2 Ag 2 O has been the most widely studied of the different silver oxides, with investigations mainly focusing on the electronic structure of the material [33][34][35][36] and the interaction and bonding between the silver and oxygen atoms (primarily concerning the degree of covalency).…”

Porous Cu–NiO modified glass carbon electrode enhanced nonenzymatic glucose electrochemical sensors

“…To solve this problem, non-enzymatic sensors based on the direct oxidation of glucose have been explored for practical applications. 17,18,[21][22][23][24] Some noble metals, including Pt, 25,26 Au 27,28 and so on, and alloys-based (containing Pt, Ru, Pb, Au and Cu) were utilized to fabricate non-enzymatic glucose sensors. [27][28][29][30] And more and more nanomaterials are being used for nonenzymatic detection of glucose.…”

Study of an amperometric glucose sensor based on Pd–Ni/SiNW electrode

“…The sensitivity of Pd-Ni/SiNW electrode is higher than that of the literature for Cu-CNTs-GCE [5] and Pt-Pb nanoparticles on MWCNTs [13]. The detection limit is lower than that of the literature for Cu-Ag 2 O NWs/GCE [15]. It can be attributed to the following points.…”

“…These nanostructured materials, including nanoparticles (NPs), nanowalls/nanowires (NWs), and carbon nanotubes (CNTs), with high surface to volume ratio, have been extensively used as the backbones of catalysts [13,[15][16][17][18][19]. For example, Pt-Pb nanoparticles on MWCNTs [13], silver oxide nanowalls on copper [15], Ni nanowire arrays modified glassy carbon [16] and copper deposited on CNTs [5], have been used as glucose sensors and exhibit excellent performance. Therefore, using nanostructured materials as the backbone of sensing electrode is well worth studying.…”