tailieunhanh - Báo cáo hóa học: " Atomic force microscopy investigation of the kinetic growth mechanisms of sputtered nanostructured Au film on mica: towards a nanoscale morphology control"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Atomic force microscopy investigation of the kinetic growth mechanisms of sputtered nanostructured Au film on mica: towards a nanoscale morphology control | Ruffino et al. Nanoscale Research Letters 2011 6 112 http content 6 1 112 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Atomic force microscopy investigation of the kinetic growth mechanisms of sputtered nanostructured Au film on mica towards a nanoscale morphology control tỉ -I- -3 3 Francesco Ruffino Vanna Torrisi Giovanni Marietta Maria Grazia Grimaldi Abstract The study of surface morphology of Au deposited on mica is crucial for the fabrication of flat Au films for applications in biological electronic and optical devices. The understanding of the growth mechanisms of Au on mica allows to tune the process parameters to obtain ultra-flat film as suitable platform for anchoring selfassembling monolayers molecules nanotubes and nanoparticles. Furthermore atomically flat Au substrates are ideal for imaging adsorbate layers using scanning probe microscopy techniques. The control of these mechanisms is a prerequisite for control of the film nano- and micro-structure to obtain materials with desired morphological properties. We report on an atomic force microscopy AFM study of the morphology evolution of Au film deposited on mica by room-temperature sputtering as a function of subsequent annealing processes. Starting from an Au continuous film on the mica substrate the AFM technique allowed us to observe nucleation and growth of Au clusters when annealing process is performed in the 573-773 K temperature range and 900-3600 s time range. The evolution of the clusters size was quantified allowing us to evaluate the growth exponent z . Furthermore we observed that the late stage of cluster growth is accompanied by the formation of circular depletion zones around the largest clusters. From the quantification of the evolution of the size of these zones the Au surface diffusion coefficient was evaluated in D T 1 H -14 m2 s exp I - .04 eV I .These l It J. quantitative data and .