Chumbimuni-Torres Karin Y, Bakker Eric, Wang Joseph
University of California San Diego, Department of Nanoengineering, La Jolla, CA 92093, USA.
Electrochem commun. 2009 Oct;11(10):1964-1967. doi: 10.1016/j.elecom.2009.08.029.
This Communication demonstrates the ability of potentiometric ion-selective electrodes (ISE) to probe the growth dynamics of metal nanoparticles in real-time. The new monitoring capability is illustrated using a solid-contact silver ISE for monitoring the hydroquinone-induced precipitation of silver on gold nanoparticle seeds. Potential-time recordings obtained under different conditions are used to monitor the depletion of the silver ion during the nanoparticle formation and shed useful insights into the growth dynamics of the nanoparticles. Such potentiometric profiles correlate well with the analogous optical measurements. The new real-time electrochemical probing of the particle growth process reflects the direct, rapid and sensitive response of modern ISE to changes in the level of the precipitated metal ion from the bulk solution and holds considerable promise for probing the preparation of different nanoscale materials.
本通讯展示了电位离子选择性电极（ISE）实时探测金属纳米颗粒生长动力学的能力。使用固体接触式银ISE监测对苯二酚诱导的银在金纳米颗粒种子上的沉淀，来说明这种新的监测能力。在不同条件下获得的电位-时间记录用于监测纳米颗粒形成过程中银离子的消耗，并为纳米颗粒的生长动力学提供有用的见解。这种电位分布图与类似的光学测量结果有很好的相关性。对颗粒生长过程进行新的实时电化学探测，反映了现代ISE对本体溶液中沉淀金属离子水平变化的直接、快速和灵敏响应，为探测不同纳米材料的制备具有广阔前景。
