GW electronic structure calculations of cobalt defects in ZnO

Franke, Dennis; Lorke, Michael; Frauenheim, Thomas; Rosa, A. L.

doi:10.1016/j.ssc.2020.113950

Cited by 1 publication

(1 citation statement)

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“…These studies concluded that Co cannot form a second phase with ZnO, because Co is fully incorporated into the host lattice, keeping the wurtzite structure of ZnO unaltered. Furthermore, a few studies have reported that Co can form Co(OH) 2 , CoO, and Co 2 O 3 phases in ZnO in the temperature range of 100-225 °C [62][63][64].…”

Section: Introductionmentioning

confidence: 99%

A dual-functional flexible sensor based on defects-free Co-doped ZnO nanorods decorated with CoO clusters towards pH and glucose monitoring of fruit juices and human fluids

Hilal

Yang

2022

Nano Convergence

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Herein, ZnO nanorods were doped with Co and decorated with CoO clusters through an in situ technique to create a CoO/Co-doped ZnO (CO/CZO) heterostructure at low temperatures (150 °C) on a flexible PET substrate. In the CO/CZO heterostructure, the Co dopant has a low energy barrier to substitute Zn atoms and adsorb over oxygen atoms and their vacancies. Therefore, it decreased the charge density (ND = 2.64 × 1019 cm−3) on non-active sites of ZnO and lowered the charge transfer resistance (317 Ω) at Co-doped-ZnO/electrolyte interface by suppressing the native defects and reducing the Schottky barrier height (− 0.35 eV), respectively. Furthermore, CoO clusters induced a p-n heterostructure with Co-doped ZnO, prevented corrosion, increased the active sites for analyte absorption, and increased the ultimate tensile strength (4.85 N m−2). These characteristics enabled the CO/CZO heterostructure to work as a highly sensitive, chemically stable, and flexible pH and glucose oxidation electrode. Therefore, CO/CZO heterostructure was explored for pH monitoring in human fluids and fruit juices, demonstrating a near-Nernst-limit pH sensitivity (52 mV/pH) and fast response time (19 s) in each human fluid and fruit juice. Also, it demonstrated high sensitivity (4656 µM mM−1 cm−2), low limit of detection (0.15 µM), a broad linear range (0.04 mM to 8.85 mM) and good anti-interference capacity towards glucose-sensing. Moreover, it demonstrated excellent flexibility performances, retained 53% and 69% sensitivity of the initial value for pH and glucose sensors, respectively, after 500 bending, stretching, and warping cycles. Graphical Abstract

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Section: Introductionmentioning

confidence: 99%