Basu Nilanjan, Satya Bharathi Moram Sree, Sharma Manju, Yadav Kanchan, Parmar Avanish Singh, Soma Venugopal Rao, Lahiri Jayeeta
School of Physics, University of Hyderabad, Hyderabad 500046, India.
Advanced Centre of Research in High Energy Materials (ACRHEM), University of Hyderabad, Hyderabad 500046, India.
Nanomaterials (Basel). 2021 Mar 2;11(3):622. doi: 10.3390/nano11030622.
Increasingly, two-dimensional (2D) materials are being investigated for their potential use as surface-enhanced Raman spectroscopy (SERS) active substrates. Hexagonal Boron Nitride (hBN), a layered 2D material analogous to graphene, is mostly used as a passivation layer/dielectric substrate for nanoelectronics application. We have investigated the SERS activity of few-layer hBN film synthesized on copper foil using atmospheric pressure chemical vapor deposition. We have drop casted the probe molecules onto the hBN substrate and measured the enhancement effect due to the substrate using a 532 nm excitation laser. We observed an enhancement of ≈10 for malachite green and ≈10 for methylene blue and rhodamine 6G dyes, respectively. The observed enhancement factors are consistent with the theoretically calculated interaction energies of MB > R6G > MG with a single layer of hBN. We also observed that the enhancement is independent of the film thickness and surface morphology. We demonstrate that the hBN films are highly stable, and even for older hBN films prepared 7 months earlier, we were able to achieve similar enhancements when compared to freshly prepared films. Our detailed results and analyses demonstrate the versatility and durability of hBN films for SERS applications.
二维（2D）材料作为表面增强拉曼光谱（SERS）活性基底的潜在用途正受到越来越多的研究。六方氮化硼（hBN）是一种类似于石墨烯的层状二维材料，主要用作纳米电子应用中的钝化层/介电基底。我们研究了利用常压化学气相沉积法在铜箔上合成的少层hBN薄膜的SERS活性。我们将探针分子滴铸到hBN基底上，并使用532 nm激发激光测量基底产生的增强效应。我们观察到孔雀石绿的增强倍数约为10，亚甲基蓝和罗丹明6G染料的增强倍数分别约为10。观察到的增强因子与理论计算的MB > R6G > MG与单层hBN的相互作用能一致。我们还观察到增强与薄膜厚度和表面形态无关。我们证明hBN薄膜非常稳定，即使对于7个月前制备的较旧hBN薄膜，与新制备的薄膜相比，我们也能够实现类似的增强。我们详细的结果和分析证明了hBN薄膜在SERS应用中的多功能性和耐久性。
