Hegde Hemant Ramakant, Chidangil Santhosh, Sinha Rajeev K
Department of Atomic and Molecular Physics, Manipal Academy of Higher Education Manipal - 576104 Karnataka India
RSC Adv. 2021 Feb 19;11(14):8042-8050. doi: 10.1039/d0ra10161c. eCollection 2021 Feb 17.
We report the synthesis of Ag nanocubes by using a sodium sulfide assisted solvothermal method. Small edge-length nanocubes (32 and 44 nm) were obtained at 145 and 155 °C reaction temperature in the synthesis process. The refractive index sensitivity of synthesized nanocubes was investigated with an aqueous solution of glucose. The refractive index sensitivity of 161 nm per RIU was found in the colloidal dispersion of nanocubes. On the LSPR chip made by immobilization of nanocubes on the (3-aminopropyl)trimethoxysilane modified glass coverslip, the obtained sensitivity was 116 nm per RIU. Detection of formaldehyde in water and milk samples was also performed with nanocubes of edge-length of 44 nm. Formaldehyde detection was performed by utilizing the interaction of the aryl amine of 4-aminothiophenol immobilized on the nanocubes and electrophilic carbon atom of the formaldehyde. In water and in diluted milk, the formaldehyde sensitivity of 0.62 and 0.29 nm μM was obtained, respectively.
我们报道了通过硫化钠辅助溶剂热法合成银纳米立方体。在合成过程中，于145和155℃的反应温度下获得了小边长的纳米立方体（32和44纳米）。用葡萄糖水溶液研究了合成纳米立方体的折射率灵敏度。在纳米立方体的胶体分散体中发现折射率灵敏度为每RIU 161纳米。在通过将纳米立方体固定在（3-氨丙基）三甲氧基硅烷修饰的玻璃盖玻片上制成的LSPR芯片上，获得的灵敏度为每RIU 116纳米。还用边长为44纳米的纳米立方体对水和牛奶样品中的甲醛进行了检测。甲醛检测是利用固定在纳米立方体上的4-氨基硫酚的芳胺与甲醛的亲电碳原子之间的相互作用进行的。在水中和稀释牛奶中，分别获得了0.62和0.29纳米/微摩尔的甲醛灵敏度。
