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    • Extraordinary H2S gas sensing performance of ZnO/rGO external and internal heterojunctions
    Authors: Tran Khoa Dang; Nguyen Tang Son; Nguyen Thi Lanh; Phan Hong Phuoc; Nguyen Ngoc Viet; Le Viet Thong; Chu Manh Hung; Nguyen Van Duy; Nguyen Duc Hoa; Nguyen Van Hieu;  Advisor: -;  Co-Author: - (2021)

    External and internal heterojunctions of reduced graphene oxide (rGO) and ZnO nanofibers (NFs) are developed for ultrasensitive H2S sensing. The gas response of both heterojunctions is significantly higher than that of bare ZnO NFs. The internal heterojun
    • Simultaneous enhancement of specific capacitance and potential window of graphene-based electric double-layer capacitors using ferroelectric polymers
    Authors: Viet ThongLe; HanjunRyu; Sang A.Han; HaoVan Bui; Viet HuongNguyen; NguyenVan Hieu; Ju-HyuckLee; Sang-WooKim; Young HeeLee;  Advisor: -;  Co-Author: - (2021)

    Despite their high power density, aqueous-based electric double-layer capacitors (EDLCs) possess relatively low energy density due to the limitation of potential window (~1.0 V) and low specific capacitance of active materials. To increase the energy density without sacrificing the power density, it is highly desired to achieve a simultaneous improvement of both specific capacitance and potential window of EDLCs. However, this remains a major challenge that is not been solved up to date. This work demonstrates that by inserting a polarized-polyvinylidene fluoride (PVDF) ferroelectric layer underneath the graphene, a simultaneous enhancement of both areal capacitance and potential window is achieved, in which the areal capacitance increases from 5.5 to 7.5 μF/cm2 (i.e., 36%) (or 55 F...