Hierarchically Self‐Assembled Star‐Shaped ZnO Microparticles for Electrochemical Sensing of Amines

Abstract

Novel, hierarchically nanostructured, star-shaped ZnO (SSZ) microparticles are synthesized by a hydrothermal synthetic route. The SSZ microparticles serve as effective platforms for electrochemical detection of amines in solution. The morphology and structure of the materials are characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Raman spectroscopy, and UV/Vis spectroscopy. The as-synthesized SSZ microparticles comprise self-assembled hexagonal prisms that possess nanometer and micrometer pores in their structure and on their surfaces-structural features that are conducive to sensing applications. An electrode fabricated by using the hierarchically nanostructured SSZ materials serve as a sensitive electrochemical sensor for detection of low concentrations of ethylenediamine, with a sensitivity of 2.98×10(-2) mA cm(-2) mm(-1) , a detection limit of 2.36×10(-2) mm, and a short response time of 8 s.

Size-Controllable Strategy of ZnO Micro/Nanorods for Electrochemical Detection of H2O2

“…5 So far, several detection systems have been formulated such as colorimetry, 6 fluorescence, 7 chemiluminescence, 8 spectrophotometry 9 and electrochemical method. 10 Compared with other methods, the electrochemical method is the most effective and fascinating technique owing to its easy operating system, high selectivity and sensitivity and comparatively less expensive. 11 That's why electrochemical sensor is widely used for sensing H 2 O 2 , glucose, urea cholesterol etc.…”

Constructing Netlike Nanosheets of ZnO/BiOCl with Heterojunction as Robust Material for Electrochemical Amine Detection

“…The ZnO/BiOCl materials‐based working electrode (GCE) with Pt and SCE electrode was immersed into a beaker containing 30 mL of 0.1 M PBS (pH=7.4). The working electrode coated with ZnO/BiOCl sample and the electrode preparation processes are shown in our previous report [9,36] . To test the sensing properties, different amounts of ammonia were added to the PBS solution in a sequential order.…”

“…The working electrode coated with ZnO/BiOCl sample and the electrode preparation processes are shown in our previous report. [9,36] To test the sensing properties, different amounts of ammonia were added to the PBS solution in a sequential order. The ammonia sensing analysis was studied using cyclic voltammetry (CV) and linear sweep voltammetry (LSV).…”

“…In this case, electrochemical detection is one of the practical methods due to its easy operation, high selectivity and sensitivity. [9,10] Presently, several metal oxide semiconductors (MOSs) including ZnO, [11][12][13][14][15] CuO [16] and SnO 2 [17][18][19][20] have broadly addressed as sensor materials for VOCs detection and those show high sensitivity, reproducibility and stability. To achieve high-efficient sensing analysis, the performance of MOSs can be further improved by surface modification, doping and heterostructures construction.…”

“…For comparison, the methods of low cost and simple operation are required for rapid analysis and real‐time detection. In this case, electrochemical detection is one of the practical methods due to its easy operation, high selectivity and sensitivity [9,10] . Presently, several metal oxide semiconductors (MOSs) including ZnO, [11–15] CuO [16] and SnO 2 [17–20] have broadly addressed as sensor materials for VOCs detection and those show high sensitivity, reproducibility and stability.…”