Mingji Li

Electrochemical Imprinted Polycrystalline Nickel–Nickel Oxide Half-Nanotube-Modified Boron-Doped Diamond Electrode for the Detection of l-Serine

This paper presents a novel and versatile method for the fabrication of half nanotubes (HNTs) using a flexible template-based nanofabrication method denoted as electrochemical imprinting. With use of this method, polycrystalline nickel and nickel(II) oxide (Ni-NiO) HNTs were synthesized using pulsed electrodeposition to transfer Ni, deposited by radio frequency magnetron sputtering on a porous polytetrafluoroethylene template, onto a boron-doped diamond (BDD) film. The Ni-NiO HNTs exhibited semicircular profiles along their entire lengths, with outer diameters of 50-120 nm and inner diameters of 20-50 nm. The HNT walls were formed of Ni and NiO nanoparticles. A biosensor for the detection of L-serine was fabricated using a BDD electrode modified with Ni-NiO HNTs, and the device demonstrated satisfactory analytical performance with high sensitivity (0.33 μA μM(-1)) and a low limit of detection (0.1 μM). The biosensor also exhibited very good reproducibility and stability, as well as a high anti-interference ability against amino acids such as L-leucine, L-tryptophan, L-cysteine, L-phenylalanine, L-arginine, and L-lysine.

Carbon dioxide sensors based on a surface acoustic wave device with a graphene–nickel–L-alanine multilayer film

Surface acoustic wave (SAW) sensors containing graphene–nickel (Ni)–L-alanine composite sensing films for carbon dioxide (CO2) detection were investigated. ST-cut quartz SAW resonators were modified with L-alanine, Ni nanoparticles and graphene by electrodeposition. The presence of graphene markedly enhanced the CO2 sensing properties of the sensor. The performance of the sensor containing a graphene–Ni–L-alanine composite film depended both on the pH of the solution used to deposit the L-alanine sensitive layer and operation temperature. The CO2 sensing mechanism of the SAW sensor is based on the adsorption of CO2 and H2O gas molecules by graphene, the catalytic reaction of Ni nanoparticles, and the reaction between L-alanine and CO2 gas molecules; that is, the three materials in the sensitive layer have a synergistic effect. From the analysis of changes in acoustic signals, exposure of the sensor to CO2 not only changed the conductivity of the film but also produced an additional capacitance, which ultimately changed the equivalent capacitance of the sensor.

CVD graphene as an electrochemical sensing platform for simultaneous detection of biomolecules

The development of electrochemical biosensors for the simultaneous detection of ascorbic acid (AA), dopamine (DA), uric acid (UA), tryptophan (Trp), and nitrite (

Theoretical investigation of surface acoustic wave propagation characteristics in periodic (AlN/ZnO)N /diamond multilayer structures

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Effect of sputtered titanium interlayers on the properties of nanocrystalline diamond films

NO2−) in human serum is reported in this work. Free-standing graphene nanosheets were fabricated on Ta wire using the chemical vapor deposition (CVD) method. CVD graphene, which here served as a sensing platform, provided a highly sensitive and selective option, with detection limits of AA, DA, UA, Trp, and

Fast growth of amorphous Si nanowires by direct current arc plasma jet chemical vapor deposition

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