Photochemical functionalisation of optical nanotips with a rhodamine chemosensor for remote through-fiber detection of Hg2+
作者:Kun Chen、Catherine Adam、Neso Sojic、Michael Schmittel
DOI:10.1039/c3ra45198d
日期:——
For remote Hg2+ detection, an array of nanotips was covalently functionalised using a versatile photochemical approach. After chemical etching of an optical fiber bundle to generate the nanotip array, a protected n-propyl amine was grafted onto the tip surface by silanisation and thereafter photodeprotected by irradiation at 365 nm. The new rhodamine-based probe 9 developed for detection of Hg2+ was linked to the liberated amino group using the HOBt/DCC protocol. The optical fiber bundles functionalised with 9 exhibited a high selectivity toward Hg2+in situ, in full analogy to its precursor 4 in solution. Titration of the functionalised optical fiber bundles using a remote detection mode showed a detection range from 10−5 to 5 × 10−3 M for mercury ions in aqueous medium.
为了实现远程Hg²⁺检测,一系列纳米尖端通过一种多用途的光化学方法进行了共价功能化。在通过化学蚀刻光学纤维束以生成纳米尖端阵列后,通过硅烷化作用将受保护的正丙基胺接枝到尖端表面,随后通过在365 nm波长下辐照进行光去保护。为检测Hg²⁺而开发的新型基于罗丹明的探针9,采用HOBt/DCC方案与释放的氨基结合。经过9功能化的光学纤维束在现场表现出了对Hg²⁺的高度选择性,与溶液中的前体4完全相似。通过远程检测模式对功能化的光学纤维束进行滴定,显示在水性介质中对汞离子的检测范围为10⁻⁵至5 × 10⁻³ M。