Hydroxyapatite/chemically reduced graphene oxide composite: Environment-friendly synthesis and high-performance electrochemical sensing for hydrazine

• Published in: Biosensors & bioelectronics Vol. 97; pp. 238 - 245
• Main Authors: Gao, Feng, Wang, Qingxiang, Gao, Ningning, Yang, Yizhen, Cai, Fuxian, Yamane, Mayoka, Gao, Fei, Tanaka, Hidekazu
• Format: Journal Article
• Language: English
• Published: England Elsevier B.V 15.11.2017; Elsevier BV
• Subjects: biosensors; Chemically-reduced; Durapatite; Durapatite - chemistry; Electrochemical Techniques; Electrochemical Techniques - methods; electrochemistry; Electrodes; Graphene oxide; Graphite; Graphite - chemistry; heat treatment; hydrazine; Hydrazine sensor; Hydrazines; Hydrazines - analysis; Hydroxyapatite; In-situ growth; Limit of Detection; Modified electrode; nanocomposites; oxidation; Oxidation-Reduction; Oxides; Oxides - chemistry; reducing agents; temperature; toxic substances; transmission electron microscopes; transmission electron microscopy; Waste Water - analysis; Wastewater; Water Pollutants, Chemical; Water Pollutants, Chemical - analysis; Chemically-reduced; Hydroxyapatite; In-situ growth; Graphene oxide; Hydrazine sensor; Modified electrode
• ISSN: 0956-5663; 1873-4235; 1873-4235
• DOI: 10.1016/j.bios.2017.06.005

It is unexpectedly found that, the in-situ growth of hydroxyapatite (HAP) on graphene oxide (GO) under a moderate temperature (85°C) can effectively trigger the reduction of GO, which needs neither extra reducing agents nor high-temperature thermal treatment. The transmission electron microscope (TEM) experiment demonstrates that the rod-like HAP particles are well attached on the surface of reduced GO (rGO) to form the composite. Electrochemical sensing assays show that the synthesized HAP-rGO nanocomposite presents excellent electrocatalytic capacity for the oxidation of a toxic chemical of hydrazine. When the HAP-rGO modified electrode was utilized as an electrochemical sensor for hydrazine detection, outstanding performances in the indexes of low fabrication cost, short response time (~2s), wide linear range, low detection limit (0.43μM), and good selectivity were achieved. The developed sensor also shows satisfactory results for the detection of hydrazine in real industrial wastewater sample were achieved. •In-situ growth of hydroxyapatite (HAP) on graphene oxide (GO) trigger the direct reduction of GO.•HAP-rGO composite exhibits outstanding electrocatalysis for oxidation of hydrazine.•HAP-rGO modified electrode was utilized as an electrochemical sensor for hydrazine.•Wide linear range and low detection limit were achieved for hydrazine analysis.