Amorphization and recrystallization of single-crystalline hydrogen titanate nanowires by N{sup +} ion irradiation

Journal Article · Sat Jun 21 00:00:00 EDT 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4884677· OSTI ID:22303986

Behera, Akshaya K.; Bandyopadyay, Malay K.; Chatterjee, Shyamal ^[1]; Facsko, Stefan ^[2]; Das, Siddhartha ^[3]

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1. School of Basic Sciences, Indian Institute of Technology Bhubaneswar, Bhubaneswar 751007 (India)
2. Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden (Germany)
3. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, Kharagpur 721302 (India)

We report on the phase transformation of hydrogen titanate (H{sub 2}Ti{sub 3}O{sub 7}) nanowires induced by 50 keV N{sup +} ion irradiation at room temperature with fluences of 1 × 10{sup 15} ions/cm{sup 2} and 1 × 10{sup 16} ions/cm{sup 2}, respectively. Using transmission electron microscopy, the internal structure of the ion irradiated nanowires is analyzed. At low fluence, a transformation from crystalline H{sub 2}Ti{sub 3}O{sub 7} to amorphous TiO{sub 2} is observed. However, at higher fluence, a remarkable crystalline-amorphous TiO{sub 2} core-shell structure is formed. At this higher fluence, the recrystallization occurs in the core of the nanowire and the outer layer remains amorphous. The phase transformation and formation of core-shell structure are explained using the thermal spike model, radiation enhanced diffusion, and classical theory of nucleation and growth under non-equilibrium thermodynamics. X-ray photoelectron spectroscopy and Raman scattering reveal further insight into the structure of the nanowires before and after ion irradiation.

• OSTI ID: 22303986
• Journal Information: Journal of Applied Physics, Vol. 115, Issue 23; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
AMORPHOUS STATE
DIFFUSION
HYDROGEN COMPOUNDS
IRRADIATION
LAYERS
MONOCRYSTALS
NANOWIRES
NITROGEN IONS
PHASE TRANSFORMATIONS
QUANTUM WIRES
RAMAN EFFECT
RECRYSTALLIZATION
TEMPERATURE RANGE 0273-0400 K
THERMODYNAMICS
TITANATES
TITANIUM OXIDES
TRANSFORMATIONS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY PHOTOELECTRON SPECTROSCOPY