Jiang Yu, Carboni Davide, Malfatti Luca, Innocenzi Plinio
Laboratorio di Scienza dei Materiali e Nanotecnologie (LMNT), Dipartimento di Chimica e Farmacia, Università di Sassari, CR-INSTM, Via Vienna 2, 07041 Sassari, Italy.
Materials (Basel). 2018 Sep 10;11(9):1674. doi: 10.3390/ma11091674.
A highly sensitive and selective Raman sensor has been developed by combining molecularly imprinted cavities, silver nanoparticles, and graphene oxide into a hybrid organic-inorganic film. The molecular imprinted nanocomposite material is an advanced platform that exhibits Graphene-mediated Surface-Enhanced Raman Scattering. The sensing layers have been prepared via sol-gel process and imprinted with rhodamine 6G to obtain selective dye recognition. Graphene oxide sheets decorated with silver nanoparticles have been incorporated into the matrix to enhance the Raman scattering signal. The template molecule can be easily removed from the films by ultrasonication in ethanol. A 712-fold Raman enhancement has been observed, which corresponds to a 2.15 × 10 count·μmol signal enhancement per molecular cavity. Besides Raman enhancement, the sensing platform has shown an excellent selectivity toward the test molecule with respect to similar dyes. In addition, the material can be reused at least 10 times without any loss of performance.
通过将分子印迹腔、银纳米颗粒和氧化石墨烯结合到一种有机-无机杂化薄膜中，开发出了一种高灵敏度和高选择性的拉曼传感器。分子印迹纳米复合材料是一个先进的平台，具有石墨烯介导的表面增强拉曼散射特性。传感层通过溶胶-凝胶法制备，并用罗丹明6G进行印迹以实现对染料的选择性识别。用银纳米颗粒修饰的氧化石墨烯片已被掺入基质中以增强拉曼散射信号。通过在乙醇中超声处理，可以很容易地从薄膜中去除模板分子。观察到拉曼增强了712倍，这相当于每个分子腔的信号增强了2.15×10计数·微摩尔。除了拉曼增强外，传感平台对测试分子相对于类似染料还表现出优异的选择性。此外，该材料可以重复使用至少10次而不会有任何性能损失。
