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    • Eco-friendly copper nanomaterials-based dual-mode optical nanosensors for ultrasensitive trace determination of amoxicillin antibiotics residue in tap water samples
    Authors: Nguyen, Tuan Anh; Ngo, Xuan Dinh; Hoang, Van Tuan; Mai, Quan Doan; Nguyen, Ha Anh; Nguyen, Tien Khi; Vu, Thi Trang | Doan, Quang Tri; Lê, Tuan Anh;  Advisor: -;  Co-Author: - (2021)

    In this study, we have developed, for the first time, a colorimetric and surface-enhanced Raman scattering (SERS) dual-mode sensing platform for sensitive amoxicillin (AMX) detection by employing electrochemically-synthesized copper nanoparticles (CuNPs) and copper-graphene oxide (Cu-GO) nanocomposites with low cost and high purity. The obtained results revealed that Cu-GO-based colorimetric nanosensor exhibited high sensitivity with AMX antibiotics in a linear working range from 5 to 50 µM with a limit of detection (LOD) of 1.71 µM, which was 1.3 times lower than that of CuNPs-based colorimetric nanosensor (2.17 µM). More interestingly, Cu-GO-based SERS nanosensor has a linear range ...
    • 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 mole...