tailieunhanh - Báo cáo hóa học: " Nanoscale Visualization of Elastic Inhomogeneities at TiN Coatings Using Ultrasonic Force Microscopy"

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: Nanoscale Visualization of Elastic Inhomogeneities at TiN Coatings Using Ultrasonic Force Microscopy | Nanoscale Res Lett 2009 4 1493-1501 DOI s11671-009-9426-3 NANO EXPRESS Nanoscale Visualization of Elastic Inhomogeneities at TiN Coatings Using Ultrasonic Force Microscopy J. A. Hidalgo C. Montero-Ocampo M. T. Cuberes Received 26 May 2009 Accepted 18 August 2009 Published online 16 September 2009 to the authors 2009 Abstract Ultrasonic force microscopy has been applied to the characterization of titanium nitride coatings deposited by physical vapor deposition dc magnetron sputtering on stainless steel substrates. The titanium nitride layers exhibit a rich variety of elastic contrast in the ultrasonic force microscopy images. Nanoscale inhomogeneities in stiffness on the titanium nitride films have been attributed to softer substoichiometric titanium nitride species and or trapped subsurface gas. The results show that increasing the sputtering power at the Ti cathode increases the elastic homogeneity of the titanium nitride layers on the nanometer scale. Ultrasonic force microscopy elastic mapping on titanium nitride layers demonstrates the capability of the technique to provide information of high value for the engineering of improved coatings. Keywords PVD nanostructured coatings TiN Ultrasonic force microscopy Scanning probe microscopy Nanomechanics J. A. Hidalgo El C. Montero-Ocampo CINVESTAV-IPN U. Saltillo Apdo. Postal 663 25900 Saltillo Coahuila Mexico e-mail C. Montero-Ocampo e-mail cecilmonter@ M. T. Cuberes Laboratory of Nanotechnology University of Castilla-La Mancha Pza. Manuel Meca 1 13400 Almaden Spain e-mail Introduction The technological relevance of titanium nitride TiN deposited by Physical vapor deposition PVD is reflected in its wide range of applications from hard protective coatings in cutting tool industry to biomaterial in implantable devices 1 2 . In such applications phenomena such as cracking wear and corrosion among others depend essentially on surface and subsurface features