发光筒纳米粒子作为Cr (VI) 的化学选择性传感器
Sarah J Toal1, Kelsey A Jones, Douglas Magde
1University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358, USA.
Journal of the American Chemical Society
|August 18, 2005
概括
子纳米颗粒的体悬浮物作为选择性化学传感器用于检测致癌 (VI). 这种方法采用光火,在环境监测中达到十亿分之百的检测极限.
科学领域:
- 材料科学 材料科学 材料科学
- 分析化学 分析化学
- 纳米技术纳米技术
背景情况:
- 致癌 (VI) 构成严重的环境和健康风险.
- 开发对 (VI) 的选择性和敏感检测方法至关重要.
- 基于西洛的纳米粒子为传感应用提供独特的光物理特性.
研究的目的:
- 开发和表征体筒子纳米颗粒作为选择性化学传感器 (VI).
- 研究这些纳米粒子的检测机制和性能.
- 评估开发的传感器系统的选择性和灵敏性.
主要方法:
- 甲基化通过化胺的功能化.
- 通过将水添加到THF溶液中来制备合体筒状纳米颗粒.
- 检测分析物通过电子转移火的silole合体光.
- 使用动态光散射和AFM进行粒子大小和分散的表征.
- 在溶液,合体和大量固体状态下分析光寿命.
主要成果:
- 丝纳米颗粒表现出光,在485nm发射 (在360nm激发).
- (VI) 的检测极限在10亿分之百的范围内.
- 斯特恩-沃尔默图表显示的线性高达10 ppm,的和度接近5-10 ppm.
- 颗粒大小大约为100nm,分散率为+/-25%,取决于溶剂成分.
- 在pH 7的酸盐缓冲区中的化物对CrO4的敏感性和选择性比其他离子高100倍.
结论:
- 3-aminopropylmethyl (((tetraphenyl) silole纳米颗粒的化悬浮是有效的选择性化学传感器,用于 (((VI).
- 电子转移火机制允许在低检测极限的情况下进行敏感检测.
- 开发的传感器在缓冲溶液中对CrO4{2-}具有很高的选择性,因此非常适合环境分析.
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