UV/Ozone-Oxidized Large-Scale Graphene Platform with Large Chemical Enhancement in Surface-Enhanced Raman Scattering
UV/Ozone-Oxidized Large-Scale Graphene Platform with Large Chemical Enhancement in Surface-Enhanced Raman Scattering
复制标题
DOI：
10.1021/nn204156n
复制
发表时间：
2011-12-01
期刊：
影响因子：
17.1
通讯作者：
Nam, Jwa-Min
中科院分区：
文献类型：
--
作者：
Huh, Sung;Park, Jaesung;Nam, Jwa-Min
我们使用化学气相沉积（CVD）和基于紫外线/臭氧的氧化方法制造了高度氧化的大规模石墨烯平台。该平台提供了大规模表面增强拉曼散射 (SERS) 基底，在厘米级石墨烯表面上具有 SERS 的大量化学增强和可重现的 SEAS 信号。紫外线诱导臭氧产生后，臭氧分子与石墨烯反应，在石墨烯上产生含氧基团并诱导石墨烯的p型掺杂。这些修饰引入了石墨烯表面的结构无序和缺陷，并导致石墨烯上拉曼染料分子[在本例中为罗丹明 B (RhB)、罗丹明 6G (R6G) 和结晶紫 (CV)] 基于化学机制的信号增强。重要的是，在臭氧处理 5 分钟后，由于石墨烯表面的高氧化和 p 掺杂效应，增强因子从臭氧处理前的大约 10(3) 增加到大约 10(4)，这是石墨烯有史以来最大的化学增强因子。在这种紫外线/臭氧氧化石墨烯基底的厘米级区域内，可以重复且可重复地检测到强 SERS 信号。在基于紫外线/臭氧的微图案中，经紫外线/臭氧处理的区域具有高度拉曼活性，而未经处理的区域显示出非常弱的拉曼信号。
We fabricated a highly oxidized large-scale graphene platform using chemical vapor deposition (CVD) and UV/ozone-based oxidation methods. This platform offers a large-scale surface-enhanced Raman scattering (SERS) substrate with large chemical enhancement in SERS and reproducible SEAS signals over a centimeter-scale graphene surface. After UV-induced ozone generation, ozone molecules were reacted with graphene to produce oxygen-containing groups on graphene and induced the p-type doping of the graphene. These modifications introduced the structural disorder and defects on the graphene surface and resulted in a large chemical mechanism-based signal enhancement from Raman dye molecules [rhodamine B (RhB), rhodamine 6G (R6G), and crystal violet (CV) in this case] on graphene. Importantly, the enhancement factors were increased from similar to 10(3) before ozone treatment to similar to 10(4), which is the largest chemical enhancement factor ever on graphene, after 5 min ozone treatment due to both high oxidation and p-doping effects on graphene surface. Over a centimeter-scale area of this UV/ozone-oxidized graphene substrate, strong SERS signals were repeatedly and reproducibly detected. In a UV/ozone-based micropattern, UV/ozone-treated areas were highly Raman-active while nontreated areas displayed very weak Raman signals.