首次报道了基于二硒化钒-多壁碳纳米管(VSMC)的精心设计的传感体系结构对碳百合(CRB)的灵敏测定。FTIR,XRD,FESEM,EDS,和EIS被用来评估传感器的结构完整性,结果证明了纳米材料的成功整合,导致一个强大的和敏感的电化学传感器。循环伏安法(CV)和计时电流法(CA)研究表明,传感器在pH8.0(BRB)下表现最佳,具有9.80nM的出色检测极限,线性范围为0.1至10.0µM。在VSMC/GCE上观察到CRB的热力学上更可行的氧化,与未修饰的GCE相比,峰值电位向较不积极的一侧偏移200mV。此外,该传感器表现出容易的异质电子转移,在存在多种干扰物的情况下具有良好的防污特性,稳定性好,和可重复的分析性能。最后,所开发的传感器已经过验证,用于实时定量来自加标水的CRB,食物,和生物样本,其中描述了可接受的回收率(98.6至101.5%),RSD值在0.35至2.23%之间。Further,为了得出可能的传感机制,C的价态轨道投影态密度(PDOS),H,和分离的CRB分子的N原子,使用密度泛函理论(DFT)计算来计算VSe2+CNT和VSe2+CNT+CRB。从CRB的C和N原子的价态2p轨道到CNT的主要电荷转移负责CRB分子的电化学传感。
For the first time the sensitive determination of carbendatim (CRB) is reported utilizing a well-designed sensing architecture based on vanadium diselenide-multiwalled carbon nanotube (VSMC). FTIR, XRD, FESEM, EDS, and EIS were employed to evaluate the sensor\'s structural integrity, and the results demonstrated the successful integration of nanomaterials, resulting in a robust and sensitive electrochemical sensor. Cyclic voltammetry (CV) and chronoamperometric (CA) investigations showed that the sensor best performed at pH 8.0 (BRB) with an excellent detection limit of 9.80 nM with a wide linear range of 0.1 to 10.0 µM. A more thermodynamically viable oxidation of CRB was observed at the VSMC/GCE, with a shift of 200 mV in peak potential towards the less positive side compared with the unmodified GCE. In addition, the sensor demonstrated facile heterogeneous electron transfer, favorable anti-fouling traits in the presence of a wide range of interferents, good stability, and reproducible analytical performance. Finally, the developed sensor was validated for real-time quantification of CRB from spiked water, food, and bio-samples, which depicted acceptable recoveries (98.6 to 101.5%) with RSD values between 0.35 and 2.23%. Further, to derive the possible sensing mechanism, the valence orbitals projected density of states (PDOS) for C, H, and N atoms of an isolated CRB molecule, VSe2 + CNT and VSe2 + CNT + CRB were calculated using density functional theory (DFT) calculations. The dominant charge transfer from the valence 2p-orbitals of the C and N atoms of CRB to CNT is responsible for the electrochemical sensing of CRB molecules.