Coulombic Effect of Amphiphiles with Metal Nanoparticles on Laser Induced Breakdown Spectroscopy Enhancement
Coulombic Effect of Amphiphiles with Metal Nanoparticles on Laser Induced Breakdown Spectroscopy Enhancement
复制标题
金属纳米颗粒两亲物对激光诱导击穿光谱增强的库仑效应
DOI：
10.1021/acs.jpcc.8b03008
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发表时间：
2018
影响因子：
3.7
通讯作者：
Hu Bitao
中科院分区：
文献类型：
--
作者：
Wu Keyan;Shen Jie;Cao Da;Cheng Huibo;Sun Shaohua;Hu Bitao
报道了利用纳米粒子和两亲分子增强激光诱导击穿光谱(LIBS)发射的实验证据。结果表明，十六烷基三甲基溴化铵的阳离子两亲性分子吸附在Au纳米颗粒上后，在766.5和769.9 nm处的K-I谱线发射增强，而阴离子两亲性的十二烷基硫酸钠和单独的Au纳米颗粒则没有观察到LiBS信号。这种显著的增强可以归因于阳离子两亲性和带负电荷的Au NPs之间的库仑引力，以及由于Au NPs的存在而导致的电场的增强。钾的检出限为13 ppb。该技术为提高LIBS的检测灵敏度提供了一种有效的方法。
In this paper, an experimental evidence of enhanced laser-induced breakdown spectroscopy (LIBS) emission using nanoparticles and amphiphiles was reported. The measurement showed an enhanced emission from the K-I lines at the wavelengths of 766.5 and 769.9 nm when the cationic amphiphile of hexadecyl trimethyl ammonium bromide was adsorbed on Au NPs, but no LIBS signal was observed for the anionic amphiphile of sodium dodecyl sulfate or for Au NPs alone. This significant enhancement can be attributed to Coulombic force of attraction between the cationic amphiphile and negatively charged Au NPs and hence the enhanced electric field due to the existence of Au NPs. The detection limit for potassium was shown to be 13 ppb. The new technique provides an effective method for the improvement of the detection sensitivity of LIBS.