Nancy Parvathy, Nair Anju K, Antoine Rodolphe, Thomas Sabu, Kalarikkal Nandakumar
School of Pure and Applied Physics, Mahatma Gandhi University, Kottayam 686560, India.
Department of Physics, St. Teresas's College, Ernamkulam 682011, India.
Nanomaterials (Basel). 2019 Aug 26;9(9):1201. doi: 10.3390/nano9091201.
Gold decorated graphene-based nano-hybrids find extensive research interest due to their enhanced chemical catalytic performance and biochemical sensing. The unique physicochemical properties and the very large surface area makes them propitious platform for the rapid buildouts of science and technology. Graphene serves as an outstanding matrix for anchoring numerous nanomaterials because of its atomically thin 2D morphological features. Herein, we have designed a metal-graphene nano-hybrid through pulsed laser ablation. Commercially available graphite powder was employed for the preparation of graphene oxide (GO) using modified Hummers' method. A solid, thin gold (Au) foil was ablated in an aqueous suspension of GO using second harmonic wavelength (532 nm) of the Nd:YAG laser for immediate generation of the Au-GO nano-hybrid. The synthesis strategy employed here does not entail any detrimental chemical reagents and hence avoids the inclusion of reagent byproducts to the reaction mixture, toxicity, and environmental or chemical contamination. Optical and morphological characterizations were performed to substantiate the successful anchoring of Au nanoparticles (Au NPs) on the GO sheets. Remarkably, these photon-generated nano-hybrids can act as an excellent surface enhanced Raman spectroscopy (SERS) platform for the sensing/detection of the 4-mercaptobenzoic acid (4-MBA) with a very low detection limit of 1 × 10 M and preserves better reproducibility also. In addition, these hybrid materials were found to act as an effective catalyst for the reduction of 4-nitrophenol (4-NP). Thus, this is a rapid, mild, efficient and green synthesis approach for the fabrication of active organometallic sensors and catalysts.
由于其增强的化学催化性能和生化传感能力，金修饰的石墨烯基纳米杂化物引起了广泛的研究兴趣。独特的物理化学性质和非常大的表面积使其成为科学技术快速发展的有利平台。由于其原子级薄的二维形态特征，石墨烯是锚定众多纳米材料的出色基质。在此，我们通过脉冲激光烧蚀设计了一种金属 - 石墨烯纳米杂化物。使用改良的Hummers法，采用市售石墨粉制备氧化石墨烯（GO）。使用Nd:YAG激光的二次谐波波长（532 nm）在GO的水悬浮液中烧蚀固体薄金（Au）箔，以立即生成Au-GO纳米杂化物。这里采用的合成策略不需要任何有害的化学试剂，因此避免了反应混合物中试剂副产物的混入、毒性以及环境或化学污染。进行了光学和形态表征，以证实金纳米颗粒（Au NPs）成功锚定在GO片上。值得注意的是，这些光生纳米杂化物可以作为出色的表面增强拉曼光谱（SERS）平台，用于传感/检测4-巯基苯甲酸（4-MBA），检测限低至1×10⁻⁸ M，并且还具有更好的重现性。此外，发现这些杂化材料是还原4-硝基苯酚（4-NP）的有效催化剂。因此，这是一种用于制造活性有机金属传感器和催化剂的快速、温和、高效且绿色的合成方法。
