Hydrogenated black TiO2 nanowires decorated with Ag nanoparticles as sensitive and reusable surface-enhanced Raman scattering substrates
Hydrogenated black TiO2 nanowires decorated with Ag nanoparticles as sensitive and reusable surface-enhanced Raman scattering substrates
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DOI：
10.1039/c5ra04352b
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发表时间：
2015-04
期刊：
影响因子：
3.9
通讯作者：
Yufeng Shan;Yong Yang;Yanqin Cao;Hao Yin;Nguyen Viet Long;Zhengren Huang
中科院分区：
文献类型：
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作者：
Yufeng Shan;Yong Yang;Yanqin Cao;Hao Yin;Nguyen Viet Long;Zhengren Huang
近年来，表面增强拉曼散射（Sers）由于其超灵敏、快速和无损的分析、检测和成像而受到人们的极大关注。高灵敏度、稳定性和可回收性的基底对于实现该技术在各个领域的实用潜力具有重要意义，例如痕量分析、诊断和刑事调查。在这项工作中，我们介绍了晶圆级银修饰的氢化黑色二氧化钛纳米线作为活性Sers衬底的氢化。Ag/H-TiO 2纳米线衬底提供了一个相对增强因子高达1002相比，氢化前的衬底和检测限提高了至少三个数量级相比，R6 G检测。此外，氢化TiO 2/Ag还具有出色的稳定性，并且在紫外线照射下通过自清洁可回收利用。这种优异的Sers性能归因于氢化非晶层和三价钛诱导的丰富的表面电子态，以及更多的光生载流子可能有助于化学和电磁增强。拉曼信号的相对标准偏差（RSD）值小于0.15，证实了氢化复合Sers基底的再现性。因此，杂化Sers基底在自清洁、重复性和稳定性方面具有很大的优势，使其成为灵敏和可回收的Sers检测的有希望的候选者。
Recently, surface-enhanced Raman scattering (SERS) has been the subject of great interest because of its ultrasensitive, rapid and nondestructive analysis, detection, and imaging. Highly sensitive, stable and recyclable substrates are of great importance in fulfilling the practical potential of the technique in various fields, such as trace analysis, diagnosis and criminal investigation. In this work, we introduce wafer-scale Ag-modified hydrogenated black TiO2 nanowires as active SERS substrate by hydrogenation. The Ag/H–TiO2 NWs substrates deliver a relative enhancement factor of up to ∼102 compared with the substrate before hydrogenation and a detection limitation improved by at least three orders of magnitude compared with R6G detection. Moreover, hydrogenated TiO2/Ag also exhibits outstanding stability, and is recyclable by self-cleaning under UV irradiation. The excellent SERS performance is ascribed to the abundant surface electronic states induced by the hydrogenated amorphous layers and trivalent titanium, and more photogenerated charge carriers may contribute to the chemical and electromagnetic enhancement. The relative standard deviation (RSD) value for Raman signals less than 0.15 confirms the reproducibility of the hydrogenated composite SERS substrate. Therefore, the hybrid SERS substrates have great advantages in self-cleaning, reproducibility and stability, making them promising candidates for sensitive and recyclable SERS detection.