Browsing by Author "Coffinier, Yannick"

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    Electrophoretic deposition of carbon nanofibers/Co(OH)2 nanocomposites : application for non-enzymatic glucose sensing
    (Wiley-VCH Verlag, 2016) Wang, Qian; Ma, Yao; Jiang, Xin; Yang, Nianjun; Coffinier, Yannick; Belkhalfa, Hakim; Dokhan, Nahed; Li, Musen; Boukherroub, Rabah; Szunerits, Sabine
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    Silicon nanowire-hydrogenated TiO2 core-shell arrays for stable electrochemical micro-capacitors
    (Elsevier, 2021) Bencheikh, Yasmina; Addad, Ahmed; Coffinier, Yannick; Kumar, Umesh; Roussel, Pascal; Szunerits, Sabine; Hadjersi, Toufik; Amin, Mohammed A.; Abaidia, Seddik-El-Hak; Boukherroub, Rabah
    In this paper, we fabricated silicon nanowire-TiO2 core-shell arrays in a two-step process. First, silicon nanowire arrays (SiNW) were prepared in HF/AgNO3 aqueous solution using metal-assisted chemical etching of bulk silicon. Then, atomic layer deposition (ALD) technique was applied to coat a 20 nm thin shell TiO2 film. The TiO2/SiNW substrates were afterward annealed at 400°C in hydrogen atmosphere for 4 h and tested as electrode materials for electrochemical micro-capacitors. The electrochemical features of the constructed H−TiO2/SiNW electrode were assessed in an aqueous 1 M Na2SO4 electrolyte solution and revealed that the specific capacitance increased six times compared to non-annealed TiO2/SiNW and 20-fold compared to a reference SiNW electrode under the same operating conditions. Importantly, H−TiO2/SiNW also displayed a high stability over 30,000 cycles at 0.1 mA cm−2 with an overall decrease of 19% of the initial capacitance. The hydrogen treatment increased the density of hydroxyl group and enhanced the carrier density on TiO2 surface improving the capacitive properties of H−TiO2/SiNW