Browsing by Author "Liao, Xiaoning"

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    An antifouling electrochemical sensor based on multiwalled carbon nanotubes functionalized black phosphorus for highly sensitive detection of carbendazim and corresponding response mechanisms analyses
    (2023) Liao, Xiaoning; Luo, Xiaoyao; Li, Yiyang; Zhou, Ying; Liang, Qi; Feng, Kehuai; Camarada, Maria Belen; Xiong, Jianhua
    Carbendazim (CBZ) was widest used in agriculture for its high efficiency in controlling of fungal diseases. However, CBZ can pose serious contamination to agricultural products and water resource for its long half-lives and high toxicity. Therefore, precise detection of CBZ residues is very important for human health and envi-ronmental safety concerns. Nevertheless, the inherent electrode fouling effect caused by CBZ products hinders the precise and practical determination of CBZ. Herein, a novel highly antifouling heterostructure based on carboxylated multiwalled carbon nanotubes (MWCNT-COOH) functionalized black phosphorus (BP) have been successfully developed via a facile sonication assisted self-assembly method. The electrochemical interface of BP/ MWCNT-COOH modified glassy carbon electrode shows excellent catalytic activity to CBZ oxidation and good electrode antifouling effect, ensuring repeatable and precise detection of CBZ. In addition, the sensor shows a wide linearity from 9.0 nM to 1000 nM with a detection limit of 4.0 nM which superior to most of previous work. Moreover, the BP-based non-enzymatic sensor shows good selectivity and satisfactory recoveries for real sample analysis, confirming its highly practical application. The antifouling mechanism to CBZ for the sensor and the interaction mechanism between MWCNTs-COOH and BP were also illustrated by theory calculations.
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    Anchoring black phosphorus quantum dots over carboxylated multiwalled carbon nanotubes: A stable 0D/1D nanohybrid with high sensing performance to Ochratoxin a
    (2022) Huang, Zhiwen; Ceron, Maria Luisa; Feng, Kehuai; Wang, Dan; Camarada, Maria Belan; Liao, Xiaoning
    Exploration of an efficient ochratoxin A (OTA) screening technique is highly important because of its highly toxic effect on human health. Electrochemical sensor, characterized with high accuracy and precise, is an emerging detection technique for toxic agents in food samples. However, the inherent fouling effect and low electro-chemical activity from OTA molecular hinder its practical application in OTA detection. Herein, we prepared a novel 0D/1D nanohybrid by anchoring black phosphorus quantum dots (BPQDs) over carboxylated multiwalled carbon nanotubes (CNTs-COOH) via a facile sonication assisted assembly approach. Characterization techniques together with theoretical approximations reveal that BPQDs can anchor onto the CNTs-COOH via strong covalent reaction, endowing the nanohybrid with high conductivity, high stability and high anti-fouling property. The electrochemical sensor constructed with the 0D/1D nanohybrid shows high electrochemical activity and a good antifouling effect in OTA detection. In optimized conditions, the sensor provide a quantitative determination of OTA in a wide concentration range from 0.4 to 10 mu M with a detection limit of 0.03 mu M. Moreover, the sensor shows high reproductivity and satisfactory anti-interference ability. Satisfactory recoveries that can comparable to those of high-performance liquid chromatography indicate that the sensor is promising for the trace-level analysis of OTA in agricultural crops.
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    MoS2 quantum dots and titanium carbide co-modified carbon nanotube heterostructure as electrode for highly sensitive detection of zearalenone
    (2022) Huang, Hao; Camarada, Maria Belen; Wang, Dan; Liao, Xiaoning; Xiong, Wanming; Du, Juan; Xiong, Jianhua; Hong, Yanping
    A novel electrochemical sensor has been fabricated for sensitive determination of zearalenone (ZEA) in food samples based on molybdenum disulfide quantum dots (MoS2 QDs) and two-dimensional titanium carbide (2D-Ti3C2Tx MXene) co-modified multi-walled carbon nanotube (MWCNT) heterostructure. Physical and electrochemical characterizations reveal that 2D-Ti3C2Tx and MoS2 QDs co-modified MWCNTs yields synergistic signal amplification effect, together with large specific surface area and excellent conductivity for the heterostructure, endowing the developed sensor with high detection performance to ZEA. Under optimized conditions, the sensor shows a wide linear range from 3.00 to 300 ng mL(-1) and a low limit of detection (LOD) of 0.32 ng mL(,)(-1) which is far lower than the maximum residue limits (MRLs) settled by the European Commission. In addition, it exhibits excellent selectivity, high reproducibility with a relative standard deviation (RSD) of 1.1%, and good repeatability (RSD 1.1%). In real sample analysis recoveries ranged from 94.8 to 105% showing the proposed electrochemical sensor has high potential in practical applications. This work presents an effective and valuable pathway for the use of novel heterostructure in the biosensing field.