N‐Doped Hollow Porous Carbon Spheres/Bismuth Hybrid Film Modified Electrodes for Sensitive Voltammetric Determination of Trace Cadmium

Abstract

In this work, N‐doped hollow porous carbon spheres (N‐HPCSs) were synthesized by silicon dioxide template‐assisted polybenzoxazine (PB) coating strategy. The prepared N‐HPCSs have a smooth hollow ball structure surrounded by a well‐defined porous shell. Combining with in‐situ plating of Bi film, the N‐HPCSs were further fabricated a sensitive electrochemical platform for determination trace levels of Cd(II) by differential pulse anodic stripping voltammetry (DPASV). Under the optimized conditions, the Bi‐N‐HPCSs based sensor displays a linear response to Cd(II) over the range of 0.5 μg L−1 to 150 μg L−1. Meanwhile, the limit of detection (LOD, S/N=3) is estimated to be around 0.16 μg L−1 for Cd(II), which is 31 times lower than the safety values set by United States Environmental Protection Agency (EPA) for the drinking water. Moreover, the proposed method was successfully applied to detection of Cd(II) in tap water and lake water, and the analytical results of the presented method are agreed well with inductively coupled plasma‐mass spectrometry (ICP‐MS) data. Due to the excellent analytical performance, the fabricated electrode is promised for future development in monitoring of cadmium pollution in the environment.

Glassy Carbon Electrode Modified via Molybdenum Disulfide Decorated Multiwalled Carbon Nanotubes for Sensitive Voltammetric Detection of Aristolochic Acids

“…The phenomenon is potentially because the AAs undergo a rapid adsorption process on the modified electrode within seconds. Subsequently, peak currents increase linearly with accumulation time up to 100 s. When the accumulation time is further extended, the value of peak current moves towards a platform due to the saturation of AAs on the modified electrode . Therefore, the obtained peak current versus time plot demonstrates that the optimal enrichment time is 100 s.…”

Sensitive and Label‐Free Electrochemical Immunosensor for Alpha Fetoprotein Based on N‐Doped Hollow Nanocarbon Spheres Decorated with Gold Nanoparticles

“…Several previous interesting literatures have indicated the doping materials with N can enhance dramatically the related performance, possessing broad application prospects. [40][41][42][43][44] In this work, N-doped HNS loaded with gold nanoparticles (NHNS/ Au) nanocomposite was synthesized firstly and then it was applied to modify electrode to assemble a novel, simple and label-free electrochemical immunosensor of AFP (Scheme 1). The Au particles cannot only improve the sensing performances, but also offer supporting platform for immobilizing AFP antibody (Ab) since Ab can be assembled on the modified [6,45] ).…”

“…Several previous interesting literatures have indicated the doping materials with N can enhance dramatically the related performance, possessing broad application prospects [40–44] . In this work, N‐doped HNS loaded with gold nanoparticles (NHNS/Au) nanocomposite was synthesized firstly and then it was applied to modify electrode to assemble a novel, simple and label‐free electrochemical immunosensor of AFP (Scheme 1).…”

Sandwich-type electrochemical immunosensing of Hypopharyngeal carcinoma biomarker carcinoembryonic antigen based on N-doped hollow mesoporous nanocarbon spheres/gold hybrids as sensing platform and gold/ferrocene as signal amplifier

“…Many reports have demonstrated that N-doped carbon nanomaterials can obviously enhance the material performance and exhibit extensive application prospects. [26][27][28][29][30] Herein, for achieving highly sensitive and simple determination of CEA, N-doped HMN decorated with nanogold particles (NHMN/Au) hybrids were synthesized firstly via a simple method, and then it was used as sensing platform to immobilize Ab1 for capturing CEA target. The excellent physical/chemical properties (e.g.…”