Journal
ACS NANO
Volume 9, Issue 6, Pages 6059-6068Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b01125
Keywords
selective local laser growth; one-step direct growth; low temperature synthesis; hydrothermal growth; flexible substrate
Categories
Funding
- National Research Foundation of Korea (NRF) [2012-0008779]
- Global Frontier R&D Program on Center for Multiscale Energy System - Ministry of Science, ICT Future [2012-054172]
- R&D Convergence Program
- ISTK (Korea Research Council for Industrial Science and Technology) [B551179-10-01-00]
- Seoul National University, Institute of Advanced Machinery and Design (SNU-IAMD)
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Recent development of laser-induced hydrothermal growth enabled direct digital growth of ZnO nanowire array at an arbitrary position even on 3D structures by creating a localized temperature field through a photothermal reaction in liquid environment. However, its spatial size was generally limited by the size of the focused laser spot and the thermal diffusion, and the target material has been limited to ZnO. In this paper, we demonstrated a next generation laser-induced hydrothermal growth method to grow nanowire on a selected area that is even smaller than the laser focus size by designing laser absorption layer. The control of laser-induced temperature field was achieved through adjusting the physical properties of the substrate (dimension and thermal conductivity), and it enabled a successful synthesis of smaller nanowire array without changing any complex optics. Through precise localized temperature control with laser, this approach could be extended to various nanowires including ZnO and TiO2 nanowires even on heat sensitive polymer substrate.
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