Noble metals functionalized reduced graphene oxide as an efficient optical limiter: a combined experimental and theoretical investigation

IF 5.5 3区 材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY
M. Saravanan, Manikandan Kandasamy, K. Suresh, Brahmananda Chakraborty, Sajan D. George, T. C. Sabari Girisun, I. Vetha Potheher, V. Parthasarathy
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Abstract

Copper, silver, and gold-reduced graphene oxide nanocomposite (Cu-rGO, Ag-rGO, and Au-rGO) were fabricated via the hydrothermal method, which shows unique physiochemical properties. Environment friendly electromagnetic radiation was employed to synthesize rGO from GO. The nonlinear optical phenomenon of noble metal decorated rGO is predominantly due to excited state absorption, which arises from surface plasmon resonance and increases in defects at the surface due to Cu, Ag, and Au incorporation. It is found that the third-order nonlinear absorption coefficient was in the order of 10−10 m/W, with notable enhancements in the third-order properties of Au-rGO compared to other nanocomposites and their respective counterparts. Functionalizing rGO induces defect states (sp3), increasing NLO response. Cu, Ag, and Au exhibit higher Surface-Enhanced Raman Scattering (SERS) activity due to rGO-induced structural modifications. SERS signals are influenced by dominant signals from Au nanorods. The electronic structures for pure and doped rGO were investigated through Density Functional Theory (DFT). The computed partial density of states (PDOS) confirms the enhancement of the state in Au-doped rGO is due to the charge transference from Au to C 2p orbital. The optical absorption spectra and PDOS reveal the possibility of free carrier absorption enhancement in Au which validates experimentally observed higher two-photon absorption (β) value of Au-doped rGO. The tuning of nonlinear optical and SERS behaviour with variation in the noble metal upon rGO provides an easy way to attain tuneable properties which are exceedingly required in both optoelectronics and photonics applications.

Abstract Image

贵金属功能化还原氧化石墨烯作为高效光学限幅器:实验与理论的综合研究
通过水热法制备了铜、银和金还原氧化石墨烯纳米复合材料(Cu-rGO、Ag-rGO 和 Au-rGO),并显示出独特的理化性质。利用环境友好的电磁辐射从 GO 中合成了 rGO。贵金属装饰的 rGO 的非线性光学现象主要是由激发态吸收引起的,激发态吸收源于表面等离子体共振以及由于铜、银和金的加入导致的表面缺陷增加。研究发现,金-rGO 的三阶非线性吸收系数约为 10-10 m/W,与其他纳米复合材料及其各自的对应材料相比,金-rGO 的三阶特性明显增强。对 rGO 进行功能化可诱导缺陷态(sp3),从而提高 NLO 响应。由于 rGO 诱导的结构改性,铜、银和金表现出更高的表面增强拉曼散射(SERS)活性。SERS 信号受到来自金纳米棒的主要信号的影响。通过密度泛函理论(DFT)研究了纯 rGO 和掺杂 rGO 的电子结构。计算得出的部分状态密度(PDOS)证实,掺金 rGO 中的状态增强是由于电荷从金转移到了 C 2p 轨道。光学吸收光谱和 PDOS 揭示了金中自由载流子吸收增强的可能性,这也验证了实验观察到的掺金 rGO 更高的双光子吸收 (β) 值。随着 rGO 中贵金属的变化而调整非线性光学和 SERS 行为,为获得光电子学和光子学应用所急需的可调整特性提供了一种简便的方法。
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来源期刊
Carbon Letters
Carbon Letters CHEMISTRY, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
7.30
自引率
20.00%
发文量
118
期刊介绍: Carbon Letters aims to be a comprehensive journal with complete coverage of carbon materials and carbon-rich molecules. These materials range from, but are not limited to, diamond and graphite through chars, semicokes, mesophase substances, carbon fibers, carbon nanotubes, graphenes, carbon blacks, activated carbons, pyrolytic carbons, glass-like carbons, etc. Papers on the secondary production of new carbon and composite materials from the above mentioned various carbons are within the scope of the journal. Papers on organic substances, including coals, will be considered only if the research has close relation to the resulting carbon materials. Carbon Letters also seeks to keep abreast of new developments in their specialist fields and to unite in finding alternative energy solutions to current issues such as the greenhouse effect and the depletion of the ozone layer. The renewable energy basics, energy storage and conversion, solar energy, wind energy, water energy, nuclear energy, biomass energy, hydrogen production technology, and other clean energy technologies are also within the scope of the journal. Carbon Letters invites original reports of fundamental research in all branches of the theory and practice of carbon science and technology.
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