Controlling Nanoparticles with Atomic Precision: The Case of Au144(SCH2CH2Ph)60
Controlling Nanoparticles with Atomic Precision: The Case of Au144(SCH2CH2Ph)60
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DOI：
10.1021/nl902300y
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发表时间：
2009-12-01
期刊：
影响因子：
10.8
通讯作者：
Jin, Rongchao
中科院分区：
文献类型：
--
作者：
Qian, Huifeng;Jin, Rongchao
我们报道了一种简单的两步合成方法来制备真正的单分散Au-144(SCH_2Ph)(60)纳米颗粒，其配方通过电喷雾质谱仪结合其他表征来确定。我们的合成方法的一个显著优势在于，它只产生Au-144(SCH_2Ph)(60)纳米颗粒，因此消除了非常困难的合成后尺寸分离步骤。这一优点使得该方法及其产生的纳米颗粒类型在实际应用中具有广泛的实用价值。与较大的Au纳米晶体(通常为~gt；2 nm)不同，Au-144(SCH_2Ph)(60)纳米粒子是结晶的，在类似于520 nm(对于球形粒子)处显示出显著的表面等离子体共振带，相反，Au-144(SCH_2Ph)(60)纳米粒子显示出阶梯状的多带吸收光谱，表明粒子中电子的量子限制。此外，这些超小的纳米颗粒不像Au纳米晶或块金那样采用面心立方结构。
We report a facile, two-step synthetic method for preparing truly monodiserse Au-144(SCH2CH2Ph)(60) nanoparticles with their formula determined by electrospray mass spectrometry in conjunction with other characterization. A remarkable advantage of our synthetic approach lies in that it solely produces Au-144(SCH2CH2Ph)(60) nanoparticles, hence, eliminating nontrivial, postsynthetic steps of size separation, which has proven to be very difficult. This advantage makes the approach and the type of nanoparticles generated by it of broad utility for practical applications. Unlike their larger counterparts, Au nanocrystals (typically >2 nm) that are crystalline and show a prominent surface plasmon resonance band at similar to 520 nm (for spherical particles), the Au-144(SCH2CH2Ph)(60) nanoparticles instead exhibit a stepwise, multiple-band absorption spectrum, indicating quantum confinement of electrons in the particle. In addition, these ultrasmall nanoparticles do not adopt face-centered cubic structure as in Au nanocrystals or bulk gold.