Mesoporous Au films assembled on flexible cellulose nanopaper as high-performance SERS substrates
Mesoporous Au films assembled on flexible cellulose nanopaper as high-performance SERS substrates
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DOI：
10.1016/j.cej.2021.129445
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发表时间：
2021-04-13
影响因子：
15.1
通讯作者：
You, Jungmok
中科院分区：
文献类型：
--
作者：
Kim, Dabum;Kim, Jeonghun;You, Jungmok
据报道，通过使用聚合物胶束的电化学沉积方法，在柔性纤维素纳米纤维（CNF）纸上制造纳米结构介孔金膜，用于高性能表面增强拉曼散射（SERS）基底。将银纳米线（AgNW）涂覆在2,2,6,6-四甲基哌啶-1-氧化CNF纳米纸（TEMPO-CNF）上，所得AgNW@TEMPO-CNF基底用作导电电极，引导介孔Au的厚度可控电沉积。有趣的是，介孔金在AgNW@TEMPO-CNF纳米纸上的电沉积形成了各向异性纳米级折痕和通道的致密网络，而在平面金电极上的沉积则形成圆形介孔。对两种类型的结构进行的数值模拟表明，这些各向异性介孔比圆形介孔膜每单位面积产生更多的热点。重要的是，mAu@AgNW@TEMPO-CNF 纳米纸能够在低至 100 fM 的浓度下对罗丹明 6G 进行高灵敏度检测，增强因子为 8.72 x 1011，并且具有出色的重现性。为了证明其在实际化学检测测量中的实用性，SERS 基板用于检测农药福美双和模型气体 2 萘硫醇；检测限分别为 10 fM 和 1 ppb。由 mAu@AgNW@TEMPO-CNF 纳米纸组成的 SERS 基底可以作为一种廉价、灵活且稳定的化学检测平台来检测溶液和气相分析物。
The fabrication of nanoarchitectured mesoporous gold films on flexible cellulose nanofiber (CNF) paper is reported for high-performance surface-enhanced Raman scattering (SERS) substrates via an electrochemical deposition method using polymeric micelles. Silver nanowires (AgNWs) are coated onto 2,2,6,6-tetramethylpiperidine-1-oxy-oxidized CNF nanopaper (TEMPO-CNF), and the resulting AgNW@TEMPO-CNF substrate is used as a conductive electrode to guide the thickness-controllable electrodeposition of mesoporous Au. Interestingly, the electrodeposition of mesoporous Au on the AgNW@TEMPO-CNF nanopaper formed a dense network of anisotropic nanoscale creases and channels, whereas deposition on flat Au electrodes makes round mesopores. Numerical simulations performed on both types of structures show that these anisotropic mesopores create more hotspots per unit area than the round mesopore films. Importantly, the mAu@AgNW@TEMPO-CNF nanopaper enables the highly sensitive detection of rhodamine 6G at concentrations as low as 100 fM, with an enhancement factor of 8.72 x 1011 and excellent reproducibility. As a demonstration of their utility in practical chemical detection measurements, the SERS substrates are used to detect the pesticide thiram and a model gas, 2naphthalenethiol; the detection limits were 10 fM and 1 ppb, respectively. SERS substrates composed of mAu@AgNW@TEMPO-CNF nanopaper may serve as an inexpensive, flexible, and stable chemical detection platform to sense both solution- and gas-phase analytes.