Li Changli, Kurniawan Mario, Sun Dali, Tabata Hitoshi, Delaunay Jean-Jacques
School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
Nanotechnology. 2015 Jan 9;26(1):015503. doi: 10.1088/0957-4484/26/1/015503. Epub 2014 Dec 10.
Nanoporous CuO layer on Cu foil with a thick Cu2O interlayer is synthesized via post annealing of previously fabricated Cu(OH)2 nanowires at 500 °C under an oxygen flow. The formation of the thick sandwiched Cu2O layer is realized through the outward diffusion of Cu ions and subsequent oxidation. An O2 pressure above the dissociation pressure of CuO is used to form a CuO layer at the outer surface of the structure, thus realizing a low cost structure having a porous and high isoelectric point layer. The Cu/Cu2O/CuO structure is used as an efficient electrode for glucose sensing. Sensitivities of [Formula: see text] at 0.8 V versus Ag/AgCl and 1066 μA mM(-1) cm(-2) at 0.6 V versus Ag/AgCl are achieved in an enzymatic and non-enzymatic glucose sensing schemes, respectively. The improved electrochemical sensing ability might be attributed to the efficient electrocatalytic reaction on the high crystal quality CuO layer and the porous structure.
通过在氧气流中于500°C对先前制备的Cu(OH)₂纳米线进行后退火，在带有厚Cu₂O中间层的铜箔上合成了纳米多孔CuO层。厚夹心Cu₂O层的形成是通过Cu离子的向外扩散和随后的氧化实现的。使用高于CuO分解压力的O₂压力在结构的外表面形成CuO层，从而实现具有多孔和高表面等电点层的低成本结构。Cu/Cu₂O/CuO结构用作葡萄糖传感的高效电极。在酶促和非酶促葡萄糖传感方案中，分别实现了相对于Ag/AgCl在0.8 V时灵敏度为[公式：见原文]以及相对于Ag/AgCl在0.6 V时灵敏度为1066 μA mM⁻¹ cm⁻²。电化学传感能力的提高可能归因于在高质量晶体CuO层和多孔结构上的高效电催化反应。
