Thomas Jeena, Periakaruppan Prakash, Thomas Vinoy, John Jancy, S Mathew, Thomas Titu, Jose Jasmine, I Rejeena, A Mujeeb
Department of Chemistry, Thiagarajar College Madurai-625009 India
Centre for Functional Materials, Christian College Chengannur - 689122 India.
RSC Adv. 2018 Dec 11;8(72):41288-41298. doi: 10.1039/c8ra08893d. eCollection 2018 Dec 7.
Anisotropic nanoparticles are ideal building blocks for a number of functional materials due to their exceptional and anisotropic optical, electronic, magnetic and mechanical properties. In this work we present systematic studies on morphology dependent ultra-sensitive thermal diffusivity and photodegradation capability of anisotropic plasmonic silver for the first time. Hydrogen peroxide centered synthesis was performed to prepare anisotropic silver nanosystems spherical (14 nm), quasi-spherical (17 nm), elliptical (18 m), rods (aspect ratio 2.1), hexagonal (22 nm) and prisms (19 nm). The synthesized nanosystems were characterized using UV-VIS spectroscopy, high resolution transmission electron microscopy (HRTEM) and band gap analysis. A dual beam mode matched thermal lensing method was adopted for evaluating the thermal diffusivity of the anisotropic system. The present anisotropic nanoparticle system exhibited strong morphology based thermal diffusivity. An increase of 140% in the thermal diffusivity value points to the nonlinear optical application potential of the anisotropic systems. Sunlight mediated photodegradation of methylene blue showed a promising increase in the degradation rate for anisotropic systems compared to other similar systems reported in the literature.
各向异性纳米粒子因其优异的各向异性光学、电子、磁性和机械性能，是多种功能材料的理想构建单元。在本工作中，我们首次对各向异性等离子体银的形态依赖性超灵敏热扩散率和光降解能力进行了系统研究。采用以过氧化氢为中心的合成方法制备了各向异性银纳米系统，包括球形（14纳米）、准球形（17纳米）、椭圆形（18纳米）、棒状（长径比2.1）、六边形（22纳米）和棱柱形（19纳米）。使用紫外可见光谱、高分辨率透射电子显微镜（HRTEM）和带隙分析对合成的纳米系统进行了表征。采用双光束模式匹配热透镜方法评估各向异性系统的热扩散率。目前的各向异性纳米粒子系统表现出基于形态的强烈热扩散率。热扩散率值增加140%表明各向异性系统具有非线性光学应用潜力。与文献中报道的其他类似系统相比，阳光介导的亚甲基蓝光降解显示出各向异性系统的降解率有可观的提高。
