Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7140533 | Sensors and Actuators B: Chemical | 2018 | 45 Pages |
Abstract
Two-dimensional (2D) α-MoO3 nano-films with thickness of 4.9â¯nm were fabricated via atomic layer deposition (ALD) technique for the first time on the wafer scale and were subsequently annealed at 200â¯Â°C. The developed MoO3 nano-films were composed of flat nanoparticles with the average size of about 35â¯nm and possessed layered orthorhombic phase (α-MoO3). The electrochemical sensor based on these 2D α-MoO3 nano-films exhibited great sensitivity of 168.72â¯Î¼Aâ¯mMâ1â¯cmâ2 to hydrogen peroxide (H2O2) and presented extremely wide linear detection range of 0.4â¯Î¼M-57.6â¯mM with the lowest detection limit of 0.076â¯Î¼M at the signal to noise ratio of 3. Furthermore, due to extremely thin nature of 2D α-MoO3 nano-films ultra-fast response/recovery time of â¼2.0â¯s was achieved under the wide linear H2O2 detection range. Additionally, the sensor based on 2D α-MoO3 nano-films was also demonstrated great long-term stability, excellent selectivity and high reproducibility. The 2D α-MoO3 nano-films fabricated via ALD technique in this work represent a great opportunity for development of high-performance electrochemical sensors based on 2D transition metal oxides.
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Authors
Zihan Wei, Zhenyin Hai, Mohammad Karbalaei Akbari, Dongchen Qi, Kaijian Xing, Qing Zhao, Francis Verpoort, Jie Hu, Lachlan Hyde, Serge Zhuiykov,