Performance evaluation of an improved particle size magnifier (PSM) for single nanoparticle detection
Performance evaluation of an improved particle size magnifier (PSM) for single nanoparticle detection
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DOI：
10.1080/02786820300913
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发表时间：
2003-10-01
影响因子：
5.2
通讯作者：
de la Mora, JF
中科院分区：
文献类型：
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作者：
Kim, CS;Okuyama, K;de la Mora, JF
最近，Okuyama等人开发的粒径放大器（PSM）的几种改进已被引入用于检测直径为1 nm及以下的颗粒。然而，对它们的评价并不完整。在这里，我们提供了第一个直接测量的计数效率接近团结低于2纳米。我们使用由Sgro和费尔南德斯德拉莫拉描述的修改后的PSM，其通过窄而短的T将PSM的原始蒸汽发生器与水冷生长室热分离，在该T中发生与气溶胶的湍流混合。的计数效率被认为在很大程度上取决于气溶胶流量，蒸汽的量，和温度。使用乙二醇蒸气，在最佳条件下，计数效率为100%，低至1.6 nm（实际直径为1.2 nm），负粒子比正粒子更容易被激活。将改进后的PSM应用于金纳米颗粒粒径分布的测量，结果表明它是一种强有力的纳米颗粒气溶胶检测器。
Several modifications of the particle size magnifier (PSM) developed by Okuyama et al. have been introduced recently for detection of particles at diameters of 1 nm and below. However, their evaluation has been incomplete. Here we provide the first direct measurements of counting efficiencies near unity below 2 nm. We use the modified PSM described by Sgro and Fernandez de la Mora, which separates thermally the PSM's original vapor generator from the water-cooled growth chamber by means of a narrow and short T where turbulent mixing with the aerosol takes place. The counting efficiency is seen to depend greatly on the aerosol flow, the amount of vapor, and temperature. With ethylene glycol vapor, under optimal conditions, the counting efficiency is 100% down to 1.6 nm ( actual diameter of 1.2 nm), and negative particles are more easily activated than positive particles. The improved PSM is applied to the measurement of gold nanoparticle size distributions, and the results show it is a powerful aerosol detector for nanoparticles.