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    • Gold nanoparticle-based optical nanosensors for food and health safety monitoring: recent advances and future perspectives
    Authors: Nguyen, Ha Anh; Mai, Quan Doan; Ngo, Xuan Dinh; Tran, Quang Huy; Doa,n Quang Tri; Le, Thi Ngoc Loan; Bui, Van Hao; Le, Anh Tuan;  Advisor: -;  Co-Author: - (2022)

    Modern society has been facing serious health-related problems including food safety, diseases and illness. Hence, it is urgent to develop analysis methods for the detection and control of food contaminants, disease biomarkers and pathogens. As the traditional instrumental methods have several disadvantages, including being time consuming, and having high cost and laborious procedures, optical nanosensors have emerged as promising alternative or complementary approaches to those traditional ones. With the advantages of simple preparation, high surface-to-volume ratio, excellent biocompatibility, and especially, unique optical properties, gold nanoparticles (AuNPs) have been demonstrated as excellent transducers for optical sensing systems. Herein, we provide an overview of the synth...
    • ZnO/ZnFe2O4 nanocomposite-based electrochemical nanosensors for the detection of furazolidone in pork and shrimp samples: exploring the role of crystallinity, phase ratio, and heterojunction formation
    Authors: Nguyen, Tuan Anh; Nguyen, Ngoc Huyen; Ngo, Xuan Dinh; Le, Khanh Vinh; Le, Minh Tung; Nguyen, Thanh Vinh; Nguyen, Van Quy; Vu, Dinh Lam; Le, Anh Tuan;  Advisor: -;  Co-Author: - (2022)

    In this study, we have investigated the influence of crystallinity, phase ratio, and heterojunction formation on the sensing performance of ZnO/ZnFe2O4 (ZnO/ZFO) nanocomposite-based electrochemical sensors for the detection of furazolidone (FZD) antibiotic drug. Results obtained show that the crystallinity and phase ratio of ZnO/ZFO nanocomposites have decisive effects on their electron transfer and active site density. Tuning the crystallinity and ZnO content of ZnO/ZFO nanocomposites is an effective way to enhance the FZD electrochemical sensing performance. Findings from this research suggested that the formation of ZnO/ZFO heterojunction could significantly improve their electrochemical responses for FZD due to arising of the internal electric field and redistribution of Zn2+, F...
    • Functionalized-AgNPs for Long-Term Stability and Its Applicability in the Detection of Manganese Ions
    Authors: Hoang, Van Tuan; Mai, Mai; Le, Thi Tam; Vu, Ngoc Phan; Nguyen, Tien Khi; Phuong, Dinh Tam; Tran, Quang Huy; Le, Anh Tuan; Ngo, Xuan Dinh; Tran, Hoang Vinh;  Advisor: -;  Co-Author: - (2020)

    In this study, silver nanoparticles (AgNPs) were functionalized by various molecules, including sodium borohydride (NaBH4), polyhexamethylene biguanide hydrochloride (PHMB), and Tween 80 to investigate the long-term stabilization of AgNPs in an aqueous dispersion. PHMB-functionalized silver nanoparticles (AgNPs/PHMB) exhibited better stability than others and could be stored at ambient temperature for at least 180 days. In addition to creating stabilization based on the electrostatic repulsion, the use of PHMB helped to increase the degree of stability of the colloidal AgNPs for a long time owing to strong interactions between Ag atoms on AgNPs with nitrogen (N) positions in PHMB molecules. .e formed bond led to improving maintenance ability of the electrostatic repulsion layer amon...