Recent Developments in Biological, Structural and Functional Thin Films and Coatings: Functional Surfaces and Thin Films II
Sponsored by: TMS Functional Materials Division, TMS: Thin Films and Interfaces Committee
Program Organizers: Adele Carradň, Université de Strasbourg IPCMS; Nancy Michael, University of Texas at Arlington; Ramana Chintalapalle, UTEP; Heinz Palkowski, Clausthal Univ of Technology; Vikas Tomar, Purdue Univ; Nuggehalli Ravindra, NJIT

Tuesday 2:00 PM
February 28, 2017
Room: Pacific 18
Location: Marriott Marquis Hotel

Session Chair: Nuggehalli Ravindra, New Jersey Institute of Technology; Adele Carradň, Université de Strasbourg IPCMS

2:00 PM  Keynote
Conducting Polymer/Nanocarbons Composites: New Opportunities And Scientific Challenges For Material Science: Emanuela Tamburri1; 1University of Rome "Tor Vergata"
    The production of nanocomposites based on conductive polymers (CP) is today at the forefront of industrial applications. The prominent role played by CP in fields ranging from sensing, catalysis, optoelectronics to energy storage/production is urging to explore new polymer-based compounds and innovative synthetic approaches able to improve their functional properties. Presently we are developing methodologies for the production of CP-based nanocomposites with carbon nanostructures as guest components. In this communication, some interesting results obtained using various chemical and electrochemical routes to produce nanocarbons/CP nanocomposites by “in situ polymerization” are illustrated. The peculiar properties of nanocarbons are found to not only improve the chemico-physical (mechanical, thermal, electrical, etc..) properties of the host polymeric matrices, but to also act on the polymerization mechanism. Triggered by nanocarbons presence, the final nanocomposites show characteristic arrangements of the polymer segments into differently shaped morphological features with not convetional organizations suitable for many technological applications.

2:40 PM  Invited
Quantification of SiC Nano Particles in Mg-SiC Composites Using USAXS Technique: Prakash Srirangam1; 1University of Warwick
    Magnesium metal matrix nano composites (MMNC) are highly promising materials due to their excellent strength to weight ratio as well as excellent mechanical and performance properties. However, the challenge is to produce cast based MMNCs with a uniformly dispersed nano sized reinforced particles into the molten melts. In this study, ultrasonic treatment of molten metal was used to uniformly disperse SiC nano particles in Mg matrix. Another challenge is to characterize nano SiC particles to obtain quantified information such as the average size, size distribution and number density of particles in the matrix. Ultra-small angle X-ray scattering (USAXS) is a powerful technique to determine the structural information of inhomogeneities sized several nano meters to 5 microns. USAXS experiments were performed at Advanced Photon Source, USA. This talk covers the application of USAXS technique in quantification of SiC nano particles in Mg composites. Further, USAXS results were supported with TEM microscopy.

3:10 PM  
Electrodeposition of Conductive Polymers on Diamond-coated Titanium Substrates: Melania Reggente1; Emanuela Tamburri2; Sara Politi2; Marco Natali1; Daniele Passeri1; Marco Rossi1; Maria Letizia Terranova2; 1Sapienza University of Rome; 2University of Rome “Tor Vergata”
    Recently Conductive polymers (CPs) have attracted a lot of interest for the fabrication of new biomaterials with a broad range of potential applications, including neural interfaces, artificial muscles and biosensors. In particular, they have been employed as coating of implantable electro-stimulation electrodes to provide a soft conductive interface with good charge-transfer properties and low impedance, suitable to improve soft-tissue integration. Moreover, thanks to their volume changes induced by the charge-compensating ions flowing into or from their backbone during redox reactions, they have been also explored for producing artificial muscles. Here we present the realization of innovative three layer hybrid bio-electrodes. Titanium sheets were used as substrate and coated with conductive and boron free diamond films onto which CPs thin layers have been subsequently electrodeposited. Different deposition times were studied and the respective morphological, structural electrochemical and conductive properties have been evaluated.

3:30 PM Break

3:50 PM  Invited
Printed Nanoparticle Films for Electronic Applications: Md Taibur Rahman1; Sadeq Saleh1; Arya Rahimi1; Subhanshu Gupta1; C. V. Ramana1; Rahul Panat1; 1Washington State University
    Nanoparticle (NP) based printed and sintered films are expected to play an important role by lowering cost and adding functionality in various applications such as high temperature sensors, energy harvesters, batteries, and antennas used in smart electronic devices and systems. In this presentation, we discuss the recent advances in the area of Aerosol Jet (AJ) printed 2-D and 3-D films at WSU for various applications. Ag NP films are evaluated for high temperature sensor applications. It is shown that although the NP based printing provides an unprecedented control over the initial microstructure, a high temperature use of such films can affect its electrical characteristics due to the film microstructural changes. An application of the AJ printed films is demonstrated, namely, a highly sensitive printed capacitive touch sensor. Lastly, we also demonstrate recent advances in 2-D films on 3-D surfaces and 3-D films for various applications using the AJ method.

4:20 PM  
Effect of Processing Parameters on Microstructure and Mechanical Properties of DC Magnetron Sputtered Ni-Zr Alloy Thin Films: Bibhu Sahu1; RAHUL MITRA1; 1Indian Institute of Technology, Kharagpur
    Studies on Ni-Zr alloy thin films have attracted interest for possibility of developing amorphous or nanocrystalline structures with applications in fuel cells, nuclear reactor components and for hydrogen storage and separation. This study reports the formation of the nano-intermetallic phases (Ni5Zr, Ni3Zr) dispersed in Ni matrix by dc magnetron co-sputtering of high purity Ni and Zr targets at ambient temperature using substrate bias voltage of 0 V. Effect of Zr content and increasing negative substrate bias voltage for transition from crystalline to amorphous structure has been discussed. Contact type surface profilometry and atomic force microscopy tests have been carried out to measure the film thicknesses and surface roughness respectively, whereas scanning electron microscopy, transmission electron microscopy and X-ray diffraction method have been used for microstructure and phase identifications respectively. Nano-indentation hardness, creep study and cratch-resistance have been compared with respect to Zr content, grain size and processing conditions.

4:40 PM  
Epitaxial Integration of Ba0.4Sr0.6TiO3/La0.7Sr0.3MnO3 Thin Film Heterostructures on Silicon: Srinivasa Rao Singamaneni1; John Prater2; Jay Narayan2; 1University of Texas; 2North Carolina State University
    In the recent past, multifunctional materials have been heavily researched owing to their novel functional properties such as magnetism, superconductivity and multiferroicity. They have potential applications in spintronics and non-volatile memory devices. However, most of the heterostructures reported in the literature were deposited on insulating oxide substrates such as SrTiO3, which cannot be used for CMOS applications, where, Si (100) is the workhorse substrate. In this invited talk, I will discuss our recent efforts in integrating these thin film heterostructures on silicon platform using a unique buffer layer approach (DME). Particularly, the data will be presented and discussed as collected from a model system Ba0.4Sr0.6TiO3/La0.7Sr0.3MnO3 (BST/LSMO), in which BST layer is ferroelectric, and LSMO is ferromagnetic at 300K. In comparison with pure LSMO layer, the magnetic coercive field and the exchange bias of BST/LSMO were increased by 2-fold, and disappeared above 200 K, which is the ferroelectric TC of BST.

5:00 PM  
Effect of Increase in the Zr Content on the Microstructural and Corrosion Properties of Nano-crystalline Cu-Zr Thin Films: Vignesh Nallasivam1; Madhuri Varadharajan1; Sivakumar Bose2; Geetha Priyadharsini B3; Angelo P C1; 1PSG college of Technology; 2CSIR-NML; 3PSG Institute of Advanced Studies
    Binary-based alloy systems, Cu-Zr nanocrystalline thin films are relatively easy to fabricate by Physical Vapor Deposition (PVD) over a wide composition ranges, as it involves direct deposition from two different metallic sources from vapor phase there by decreasing the diffusion required for grain growth during cooling. The Zr rich nanocrystalline (50-88 Zr at %) films were synthesized using PVD. The coatings are further characterized by: Field Emission Scanning Electron Microscopy (FESEM) for coating thickness and morphology, Energy Dispersive X-Ray Spectroscopy (EDS) for the chemical composition of the films, Atomic Force Microscopy (AFM) for topographical analysis, grain size and phase contrast, Glancing Incidence X-ray Diffraction (GIXRD) for phase identification, and Nano indentation to study the mechanical behavior of the Cu-Zr thin films. The study also includes the electrochemical response of the Zr rich nanocrystalline films in comparison to bare AISI 304 SS in Simulated Body Fluid (SBF).