Voltammetric and impedance behaviours of surface-treated nano-crystalline diamond film electrodes

Abstract

The electrochemical performances of hydrogen- and oxygen-terminated nano-crystalline diamond film electrodes were investigated by cyclic voltammetry and AC impedance spectroscopy. In addition, the surface morphologies, phase structures, and chemical states of the two diamond films were analysed by scanning probe microscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy, respectively. The results indicated that the potential window is narrower for the hydrogen-terminated nano-crystalline diamond film than for the oxygen-terminated one. The diamond film resistance and capacitance of oxygen-terminated diamond film are much larger than those of the hydrogen-terminated diamond film, and the polarization resistances and double-layer capacitance corresponding to oxygen-terminated diamond film are both one order of magnitude larger than those corresponding to the hydrogen-terminated diamond film. The electrochemical behaviours of the two diamond film electrodes are discussed.

Self‐Powered Bio‐Inspired Spider‐Net‐Coding Interface Using Single‐Electrode Triboelectric Nanogenerator

“…On the other hand, sliding‐type interface is normally achieved by detecting the sliding motion with pressure/tactile sensor array or strip/grating electrodes along the trace . A 9 × 9 sensor array with separated electrodes is developed to achieve real‐time detection of contact position, trajectory, velocity, and acceleration of a sliding object .…”

Piezoelectric Nanogenerators Based on Helical Carbon Materials and Polyvinyledenedifluoride–Trifluoroethylene Hybrids with Enhanced Energy‐Harvesting Performance

“…In the past few decades, the great advancements in integrated circuits, wireless communication, and wearable electronics with low power consumption have thrown great demands on developing energy‐harvesting technologies in an ambient environment. Among the developed energy‐harvesting technologies, piezoelectric energy harvesters, which convert ubiquitous and versatile kinetic energy in an ambient environment into electrical energy, have gained most attention due to their high energy‐conversion efficiency, material diversity, good scalability, and simple architectures . Inorganic piezoelectric crystals and ceramics, such as ZnO, Pb[Zr x Ti 1– x ]O 3 , and BaTiO 3 , have been widely used to fabricate piezoelectric nanogenerators (PNGs) with good performance.…”

“…Previous studies have shown that the geometry of piezoelectric materials also significantly affected the performance of the corresponding piezoelectric energy harvesters, besides their dielectric constant and piezoelectric coefficient . Structural design is one of the important parts of wearable flexible devices as well .…”

“…For example, Shenck and Paradiso implanted multilayer laminates of PVDF foils into shoes to gain electricity from the forces generated during walking . However, PVDF and its copolymer exhibit a relatively weak electromechanical coupling, with piezoelectric coefficients ranging from −25 to −38 pC N −1 , significantly limiting their energy‐conversion efficiency . Thus, different strategies were developed to improve their energy‐harvesting performances, including postprocess, to produce piezoelectric β‐phase, formation of hybrids, and control of geometries to obtain large aspect ratios .…”

Preface: Micro-Nano Technology

“…23 Also, the design of a telemetry system based on wireless power transmission for physiological parameters monitoring is proposed. 24 Three papers are shown in Nano materials field, two of which are focused on diamond film: voltammetric and impedance behaviors of surface-treated Nano-crystalline diamond film electrodes 25 and the effects of hydrogen atoms on surface conductivity of diamond film. 26 In addition, copper Nano-clusters prepared by one-step electrodeposition is reported to be applied on nitrate sensing.…”