Nitrate sensing based on Pd‐Sn bimetallic composite: a comparison between a bulk electrode and a microband electrode array

Abstract

This work presents a bulk electrode and a microband electrode array for electrochemical nitrate sensing in acidic medium. The microelectrode array is fabricated on silicon wafer by micro electro-mechanical system technique. Electrodepostion was carried out to modify tin onto the bulk palladium electrode and thus formed Pd-Sn bimetallic composite. On the microelectrode array, Pd and Sn were successively deposited to obtain a double-layer composite. The performance of the two kinds of electrodes towards nitrate sensing was investigated and compared. The microelectrode array showed better sensitivity and repeatability than the bulk electrode. The results are consistent with the unique properties of the microelectrode array in electrochemical analysis such as high current density and low background noise.

Palladium-Gold Modified Ultramicro Interdigital Array Electrode Chip for Nitrate Detection in Neutral Water

“…The pH value of the phosphate buffer was 7.2. Linear sweep voltammetry was chosen to detect the nitrate in water because it is a commonly used method for electrochemical detection of nitrate [5,6,27,28]. The detection was performed in nitrate solution with a concentration of 0.5 mg·L −1 .…”

“…The experimental process showed that the pH value of the backup electrolyte needs to be adjusted to the acidic range of about 2.0 with concentrated sulfuric acid. Pb-Sn composite sensing film modified electrode chips were developed by Yexiang Fu [5]. Thermal annealing of Cu nanowires was used to detect nitrate in the acidic environment by Jihong Liang et al [6].…”

Fabrication of high‐density microneedle masters towards the commercialisation of dissolving microneedles

“…The proposed method offers several advantages over other methods including simplicity, low cost and high-throughput opening up a great potential for the mass production of microneedle masters towards the commercialisation of dissolving microneedles. Furthermore, this method can also be used for the fabrication of conical-shaped structures for various applications such as microelectrode arrays [21], microtip arrays [22], field emitter arrays [23] and so on.…”