Method for simply and rapidly detecting CTAB (cetyltrimethyl ammonium bromide)

The invention provides a method for simply and quickly detecting CTAB (Cetyltrimethyl Ammonium Bromide), which comprises the following steps: by taking nuclear fast red as a stabilizer and AgNO3 and NaBH4 as reaction reagents, preparing AgNCs by adopting a chemical reduction method. When excitation is carried out at the wavelength of 370 nm, AgNCs shows strong fluorescence emission at the wavelength of 500 nm. Researches find that when cetyltrimethylammonium bromide (CTAB) is added into an AgNCs solution, the fluorescence intensity of the AgNCs is effectively quenched, when the concentration of the CTAB is within the range of 0.01-1.0 mmol/L, the reduction degree of the fluorescence intensity of the silver nanoclusters is in a good linear relation with the concentration of the CTAB, and the detection limit is 6.110-9 mol/L. 本发明提供了一种简单快速检测CTAB的方法，以核固红为稳定剂，AgNO3和NaBH4为反应试剂，采用化学还原法制备得到AgNCs。在370 nm激发时，AgNCs在500 nm处表现出强烈的荧光发射。研究发现，十六烷基三甲基溴化铵(CTAB)加入到AgNCs溶液中时，AgNCs的荧光强度有效被淬灭，当CTAB浓度在0.01-1.0 mmol/L的范围内，银纳米簇的荧光强度降