tailieunhanh - Báo cáo hóa học: "Facile Synthesis and Tensile Behavior of TiO2 One-Dimensional Nanostructures"

FTuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: acile Synthesis and Tensile Behavior of TiO2 One-Dimensional Nanostructures | Nanoscale Res Lett 2010 5 338-343 DOI S11671-009-9485-5 NANO EXPRESS Facile Synthesis and Tensile Behavior of TiO2 One-Dimensional Nanostructures Syed S. Amin Shu-you Li Xiaoxia Wu Weiqiang Ding Terry T. Xu Received 23 August 2009 Accepted 28 October 2009 Published online 18 November 2009 to the authors 2009 Abstract High-yield synthesis of TiO2 one-dimensional 1D nanostructures was realized by a simple annealing of Ni-coated Ti grids in an argon atmosphere at 950 C and 760 torr. The as-synthesized 1D nanostructures were single crystalline rutile TiO2 with the preferred growth direction close to 210 . The growth of these nanostructures was enhanced by using catalytic materials higher reaction temperature and longer reaction time. Nanoscale tensile testing performed on individual 1D nanostructures showed that the nanostructures appeared to fracture in a brittle manner. The measured Young s modulus and fracture strength are and GPa respectively. Keywords TiO2 nanomaterials Synthesis and characterization Nanoscale tensile testing Introduction Titanium dioxide TiO2 one-dimensional 1D nanostructures have received extensive research attention recently because of their promising applications in photo-catalysis S. S. Amin X. Wu T. T. Xu Department of Mechanical Engineering and Engineering Science The University of North Carolina at Charlotte Charlotte NC 28223 UsA e-mail ttxu@ S. Li NUANCE Center Northwestern University Evanston IL 60208 USA W. Ding Department of Mechanical and Aeronautical Engineering Clarkson University Potsdam NY 13699 USA e-mail wding@ gas and humidity sensing solar water splitting bio-scaffolds and others 1-3 . Both wet-chemistry and dry synthetic methods have been used to prepare TiO2 1D nanostructures. The wet-chemistry methods such as solgel process and anodic oxidation require further heat treatment to improve the crystallinity of as-synthesized nanostructures which adds to the complexity of the processes. A .