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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Light Scattering and Enhanced Photoactivities of Electrospun Titania Nanofibers
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Light Scattering and Enhanced Photoactivities of Electrospun Titania Nanofibers

机译：电纺二氧化钛纳米纤维的光散射和增强的光活性

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摘要

Titania nanofibers with fiber diameters ranging from 194 to 441 nm were electrospun as light-scattering photoactive materials. Transmittance UV-vis spectroscopy revealed that the scattering behavior of these samples was linearly proportional to the fiber diameter and the fiber deposition density, which is in agreement with a scattering model based on the Mie theory. The photocurrent- voltage characteristics of the nanostructured samples with a scattering band that overlapped with the absorption band of titania demonstrated a photocurrent that increased steadily with the fiber deposition density. Scattering-enhanced superior photocurrent was found to be 4.8 times higher than that of other samples without direct overlapping between the scattering and absorption bands. Photo-catalytic hydrogen evolution under UV irradiation was associated witha similar increase in scattering. The optimized hydrogen evolution rate was 34.9 μmol/g-cm~2·h, which was more than two times higher than that for other samples that had less scattering.
机译：电纺成直径为194至441 nm的Titania纳米纤维作为光散射光敏材料。透射紫外可见光谱表明，这些样品的散射行为与纤维直径和纤维沉积密度成线性比例，这与基于米氏理论的散射模型一致。具有与二氧化钛的吸收带重叠的散射带的纳米结构样品的光电流-电压特性表明，光电流随着纤维沉积密度而稳定地增加。发现散射增强的优越光电流是其他样品的4.8倍，而散射和吸收带之间没有直接重叠。紫外线照射下光催化氢的释放与散射的类似增加有关。优化后的析氢速率为34.9μmol/ g-cm〜2·h，是其他散射较少的样品的两倍以上。

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