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Ultrasensitive explosive sensors are significant in anti-terrorism and related environment issues. Herein, we proposed a novel boron-doped graphene (B-GE) modified glassy carbon electrode (GCE) applied as a simple, sensitive electrochemical high melting explosive (HMX) sensor. The morphology and structure features of B-GE were characterized. The electrochemical behaviors of HMX on the B-GE modified GCE were investigated by cyclic voltammetry (CV). Under the optimized conditions, CV was used for the quantitative detection of HMX, and the reduction peak current exhibited good linear dependence with the concentration of HMX in the ranges of 2 ∼ 20 μM and 20 ∼ 100 μM. The low detection limit (LOD) was calculated as 0.83 μM (245.81 ppb). Furthermore, the B-GE/GCE showed satisfactory repeatability, high selectivity and stability. The reduction reaction mechanism of HMX on B-GE modified electrode was explored by computational theoretical analysis. Additionally, the differences of the reduction mechanisms from nitroaromatic explosives were discussed. [ABSTRACT FROM AUTHOR]

[Display omitted] • The highly active crystal rod like Bi 2 O 3 /ZnO nanocomposite synthesized through a low cost coprecipitation method. • The modified electrode exhibits outstanding electrochemical performance towards the IP oxidation. • Bi 2 O 3 /ZnO/GCE exhibits good selectivity, stability, and reproducibility and good recovery for real sample analysis. With an increased understanding of human health in recent years, rapid and reliable methods for identifying prescription drugs have become progressively essential. In this concern, here we have demonstrated the nano crystal rod like Bi 2 O 3 /ZnO were first synthesized through a coprecipitation approach using sodium hydroxide as a precipitating agent. The prepared material was employed as an effective catalyst and then used to detect β adrenoceptor agonist isoprenaline (IP). Taking full advantage of about their improved properties, a novel electrochemical IP sensor was constructed by drop-coasting Bi 2 O 3 /ZnO on glassy carbon electrode. Various analytical and electrochemical methods were used to characterize the physical and chemical properties of prepared material. Under optimal conditions, the present sensor showed a dynamic linear range (0.04 µM to 258.4 µM) with a detection limit of 0.06 µM (n = 3). The sensitivity was calculated to be 11.45 μA μM−1 cm−2. Finally, the proposed electrode was successfully applied to the determination of IP in practical samples such as pharmaceutical and urine using standard addition method with satisfactory recovery result. [ABSTRACT FROM AUTHOR]