title: Improvement of Terahertz Wave Radiation for InAs Nanowires by Simple Dipping into Tap Water.
abstract: We report improvement of terahertz (THz) wave radiation for Si-based catalyst-free InAs nanowires (NWs) by simple dipping into tap water (DTW). In addition, the possibility of using InAs NWs as a cost-effective method for biomedical applications is discussed by comparison to bulk InAs. The peak-to-peak current signals (PPCSs) of InAs NWs measured from THz time-domain spectroscopy increased with increasing NW height. For example, the PPCS of 10 μm-long InAs NWs was 2.86 times stronger than that of 2.1 μm-long NWs. The THz spectra of the InAs NWs obtained by applying a fast Fourier transformation to the current signals showed a main frequency of 0.5 THz, which can be applied to a variety of medical imaging systems. After the DTW process, structural variation was not observed for 2.1 μm-long InAs NWs. However, the top region of several InAs NWs with heights of 4.6 and 5.8 μm merged into a conical structure. InAs NWs with a height of 10 μm resulted in a bundle feature forming above the conical shape, where the length of bundle region was 4 μm. After the DTW process, the PPCS for 10 μm-long InAs NWs increased by 15 percent compared to that of the as-grown case.
authors: Division of Advanced Materials Engineering &Research Center of Advanced Materials Development, Chonbuk National University, Jeonju 54896, Republic of Korea.|Materials Genome Center, Korea Research Institute of Standards and Science, Daejeon 34113, Republic of Korea.
authors: Dong Woo
authors: DW
authors: Park
authors: Medical Convergence Research Institute, College of Medicine, Yonsei University, Seoul 03722, Republic of Korea.
authors: Young
authors: Y
authors: Bin Ji
authors: Materials Genome Center, Korea Research Institute of Standards and Science, Daejeon 34113, Republic of Korea.
authors: Jehwan
authors: J
authors: Hwang
authors: Division of Advanced Materials Engineering &Research Center of Advanced Materials Development, Chonbuk National University, Jeonju 54896, Republic of Korea.
authors: Cheul-Ro
authors: CR
authors: Lee
authors: Materials Genome Center, Korea Research Institute of Standards and Science, Daejeon 34113, Republic of Korea.
authors: Sang Jun
authors: SJ
authors: Lee
authors: Materials Genome Center, Korea Research Institute of Standards and Science, Daejeon 34113, Republic of Korea.
authors: Jun Oh
authors: JO
authors: Kim
authors: Materials Genome Center, Korea Research Institute of Standards and Science, Daejeon 34113, Republic of Korea.
authors: Sam Kyu
authors: SK
authors: Noh
authors: Medical Convergence Research Institute, College of Medicine, Yonsei University, Seoul 03722, Republic of Korea.
authors: Seung Jae
authors: SJ
authors: Oh
authors: Applied Electromagnetic Wave Research Center, Korea Electrotechnology Research Institute, Ansan 15588, Republic of Korea.
authors: Sang-Hoon
authors: SH
authors: Kim
authors: Division of Electrical and Electronics Engineering, Korea Maritime and Ocean University, Busan 49112, Republic of Korea.
authors: Tae-In
authors: TI
authors: Jeon
authors: Department of Polymer-Nano Science and Technology, and Polymer Materials Fusion Research Centre, Chonbuk National University, Jeonju 54896, Republic of Korea.
authors: Kwang-Un
authors: KU
authors: Jeong
authors: Division of Advanced Materials Engineering &Research Center of Advanced Materials Development, Chonbuk National University, Jeonju 54896, Republic of Korea.
authors: Jin Soo
authors: JS
authors: Kim
mesh_terms: D053770:Nanowires; D055053:Terahertz Radiation; D055068:Terahertz Spectroscopy / Q000295:instrumentation / Q000379:methods*; D014867:Water
chemical_list: D014867:Water