Hydrothermal Synthesis of Boron Nitride Quantum Dots/Poly(Luminol) Nanocomposite for Selective Detection of Ascorbic Acid

Abstract

Boron nitride quantum dots (BNQDs) were synthesized hydrothermally using boric acid and urea. High-resolution transmission electron microscopy (HR-TEM) analysis confirmed the formation of BN quantum dots with the lattice size of 0.227 nm. Fouriertransform infrared (FT-IR) and Ultraviolet-visible (UV-Vis) spectroscopies revealed the B-N, O-H and N-H bond formation in the BNQDs and the maximum absorption wavelength at 269 nm. BNQDs exhibited strong fluorescence emission at a wavelength of 330 nm. Furthermore, BNQDs were coated onto a glassy carbon electrode (GCE). Followed by, poly(luminol) (Plu) was electrochemically deposited onto BNQDs/GCE from 0.1 M H 2 SO 4 containing 0.5 mM luminol in order to prepare nanocomposite (hybrid film) coated electrode with improved stability and electrochemical activity. Due to unique nature and synergetic effect between BNQDs and Poly(luminol), as-prepared hybrid Plu/BNQDs film coated GCE showed improved electrocatalytic activity for vitamin C (ascorbic acid, AA) oxidation at 0.2 V. The calibration graph was obtained from 10 to 100 μM AA by amperometry and limit of detection (LOD) was found to be 1.107 μM. The interference effects were also carried out in the presence of uric acid (UA), dopamine (DA) and glucose (Glu). Interestingly, UA, DA and Glu did not produce significant responses on the Plu/BNQDs/GCE which indicated good selectivity of the sensor for AA. Moreover, Plu/BNQDs/GCE based sensor showed reproducible and repeatable analytical performances. We propose that the Plu/BNQDs based hybrid film can be used as a selective sensor probe for the detection of the AA.

Nickel oxide decorated MoS2nanosheet-based non-enzymatic sensor for the selective detection of glucose

“…Each addition of glucose was made into the electrochemical cell in time intervals of 50 s. Upon consecutive additions of glucose to the electrochemical cell, a gradual increase in the steady-state current was observed. 77 This shows that the NiO/MoS 2 /GCE sensor has excellent catalytic activity and sensitivity towards glucose. Fig.…”

Selective detection of ascorbic acid with wet-chemically prepared CdO/SnO2/V2O5 micro-sheets by electrochemical approach

“…Moreover, the hybrids nanocomposites of MoS 2 /f-MWCNTs/ZnO and GNP/AgNR/poly (AY) decorated GCE have been shown high potentiality as electrochemical sensor to detect dopamine and ascorbic acid as reported previously [21,22]. Another report has claimed that a voltammetric detection of ascorbic acid based on Plu/BNQDs/GCE as electrochemical sensor has been performed appreciably [23]. Furthermore, Gold nanoparticledecorated MoS 2 nano-sheets [24], carbon-polyvinylchloride composite electrode [25] and molecularly imprinted polyaniline film [26] have been also reported as ascorbic acid senor.…”

The Properties and Preparation Methods of Different Boron Nitride Nanostructures and Applications of Related Nanocomposites

“…The mechanism of the hydrothermal (solvothermal) synthesis method is to use an aqueous solution (or an organic solvent) as the reaction carrier, and then the reactants are recrystallized under the reaction conditions of high temperature (100°C-1000°C) and high pressure (1 MPa-1 GPa). [139] Since the mechanism of homogeneous and heterogeneous nucleation in the hydrothermal reactions is different from the diffusion mechanism of solid reactions, so this method can create new compounds and materials that cannot be prepared by other methods. [140] For example, Huo et al [141] studied a simple and effective method for preparing functionalized natural BN quantum dots (BNQDs) with blue fluorescence by hydrothermally treating a mixture of boric acid and melamine at 200°C for 15 h. The obtained BNQDs can be easily dispersed in an aqueous medium and used as a fluorescent probe for detecting Fe 3 + with remarkable selectivity and sensitivity.…”

“…The mechanism of the hydrothermal (solvothermal) synthesis method is to use an aqueous solution (or an organic solvent) as the reaction carrier, and then the reactants are recrystallized under the reaction conditions of high temperature (100 °C–1000 °C) and high pressure (1 MPa‐1 GPa) [139] . Since the mechanism of homogeneous and heterogeneous nucleation in the hydrothermal reactions is different from the diffusion mechanism of solid reactions, so this method can create new compounds and materials that cannot be prepared by other methods [140] .…”