Ilatovskii Daniil A, Milichko Valentin, Vinogradov Alexander V, Vinogradov Vladimir V
SCAMT Laboratory, ITMO University, St. Petersburg, 197101, Russian Federation.
R Soc Open Sci. 2018 May 2;5(5):172465. doi: 10.1098/rsos.172465. eCollection 2018 May.
Sol-gel monoliths based on SiO, TiO and ZrO with holographic colourful diffraction on their surfaces were obtained via a sol-gel synthesis and soft lithography combined method. The production was carried out without any additional equipment at near room temperature and atmospheric pressure. The accurately replicated wavy structure with nanoscale size of material particles yields holographic effect and its visibility strongly depends on refractive index (RI) of materials. Addition of multi-walled carbon nanotubes (MWCNTs) in systems increases their RI and lends absorbing properties due to extremely high light absorption constant. Further prospective and intriguing applications based on the most successful samples, MWCNTs-doped titania, were investigated as reversible optical humidity sensor. Owing to such property as reversible resuspension of TiO nanoparticles while interacting with water, it was proved that holographic xerogels can repeatedly act as humidity sensors. Materials which can be applied as humidity sensors in dependence on holographic response were discovered for the first time.
通过溶胶-凝胶合成与软光刻相结合的方法，制备了基于SiO、TiO和ZrO且表面具有全息彩色衍射的溶胶-凝胶整体材料。该制备过程在接近室温及大气压的条件下进行，无需任何额外设备。具有纳米级材料颗粒尺寸的精确复制的波浪结构产生全息效应，其可见性强烈依赖于材料的折射率（RI）。在体系中添加多壁碳纳米管（MWCNT）可提高其折射率，并因其极高的光吸收常数而赋予吸收特性。基于最成功的样品——MWCNT掺杂的二氧化钛，进一步研究了其作为可逆光学湿度传感器的潜在有趣应用。由于TiO纳米颗粒在与水相互作用时具有可逆再悬浮的特性，证明了全息干凝胶可反复用作湿度传感器。首次发现了可根据全息响应用作湿度传感器的材料。
