Photochemical growth of silver nanoparticles on c- and c+ domains on lead zirconate titanate thin films
Photochemical growth of silver nanoparticles on c- and c+ domains on lead zirconate titanate thin films
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DOI：
10.1021/ja071451n
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发表时间：
2007-07-18
影响因子：
15
通讯作者：
Gallardo, Diego E.
中科院分区：
文献类型：
--
作者：
Dunn, Steve;Jones, Paul M.;Gallardo, Diego E.
报道了纳米银在锆钛酸铅薄膜负畴上的光化学生长。采用压电响应力显微镜对一种高度[100]取向的锆钛酸铅样品（比例为30:70）进行极化，其厚度为65-70 nm，生长在pt包覆的MgO上，产生了表面正、负极化的明确区域。比较了两种超带隙紫外光照射下，银纳米粒子在锆钛酸铅表面的生长情况。在这两种情况下，照明波长都导致了正畴的生长，但只有在250-200 nm高光子输出的Honle H灯的照明下，才导致银纳米粒子在负畴上的显著生长。负畴上的沉积是由电子激发到导带的能带弯曲变化、到基态的衰减速率和铁电薄膜的尺寸来解释的。银纳米粒子在负畴上的沉积速率大约是在正畴上的一半。
The photochemical growth of silver nanoparticles on the negative domains of lead zirconate titanate thin films is reported. A sample of highly [100] orientated lead zirconate titanate, with a ratio of 30:70, that was 65-70 nm thick grown on Pt-coated MgO was poled by use of piezoresponse force microscopy to produce defined regions of surface positive and negative polarization. A comparison between the growth of silver nanoparticles on the surface of the lead zirconate titanate when illuminated with two sources of super band gap UV is given. In both cases the wavelength of illumination leads to growth on the positive domains but only illumination with a Honle H lamp, with a high photon output over 250-200 nm, caused significant growth of silver nanoparticles on the negative domain. The deposition on the negative domain is explained in terms of changed band bending due to the excitation of electrons into the conduction band, the rate of decay to the ground state, and dimensions of the ferroelectric film. The rate of deposition of silver nanoparticles on the negative domains is approximately half that on the positive domains.