Ultrathin Carbon Film Electrodes from Vacuum‐Carbonised Cellulose Nanofibril Composite
Ultrathin Carbon Film Electrodes from Vacuum‐Carbonised Cellulose Nanofibril Composite
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真空碳化纤维素纳米纤维复合材料制成的超薄碳膜电极
DOI：
10.1002/elan.200900513
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发表时间：
2010
期刊：
影响因子：
3
通讯作者：
F. Marken
中科院分区：
文献类型：
--
作者：
Anne Vuorema;M. Sillanpää;Liza Rassaei;Matthetv J Wasbrough;K. Edler;W. Thielemans;Sara Dale;S. Bending;D. Wolverson;F. Marken
提出了一种在掺锡氧化铟（ITO）衬底上制备透明碳膜的新方法。ITO表面通过聚（二烯丙基二甲基氯化铵）或PDDAC作为粘合剂通过逐层静电结合涂覆有纤维素纳米纤丝（来自剑麻）。然后在500 °C下真空碳化纤维素纳米纤丝-PDDAC复合膜。所得碳膜的特征在于原子力显微镜（AFM），小角X射线散射（SAXS），广角X射线散射（WAXS），和拉曼方法。形成对ITO基板具有良好粘附性的光滑碳膜。碳膜的电化学特性是基于在磷酸盐缓冲溶液中对苯二酚的氧化和苯醌的还原。观察到纤维素纳米原纤维-PDDAC膜对电子转移速率的适度影响。碳化后，薄膜对电子转移速率的影响更为显著。对于碳化后的40层纤维素纳米纤丝-PDDAC膜，电子转移速率发生两个数量级的变化，这可能是由于氢醌/苯醌系统与电极表面的更好的相互作用。
A novel way to produce ultrathin transparent carbon layers on tin-doped indium oxide (ITO) substrates is developed. The ITO surface is coated with cellulose nanofibrils (from sisal) via layer-by-layer electrostatic binding with poly(diallyldimethylammonium chloride) or PDDAC acting as the binder. The cellulose nanofibril-PDDAC composite film is then vacuum-carbonised at 500 °C. The resulting carbon films are characterised by atomic force microscopy (AFM), small angle X-ray scattering (SAXS), wide-angle X-ray scattering (WAXS), and Raman methods. Smooth carbon films with good adhesion to the ITO substrate are formed. The electrochemical characterisation of the carbon films is based on the oxidation of hydroquinone and the reduction of benzoquinone in aqueous phosphate buffer media. A modest effect of the cellulose nanofibril-PDDAC film on the rate of electron transfer is observed. The effect of the film on the rate of electron transfer after carbonisation is more dramatic. For a 40-layer cellulose nanofibril-PDDAC film after carbonisation a two-order of magnitude change in the rate of electron transfer occurs presumably due to a better interaction of the hydroquinone/benzoquinone system with the electrode surface.