ECI Digital Archives

Title

Fabrication of Octahedral Tantalum Cluster Film by Electrophoretic Deposition

Authors

Nguyen Thi Kim Ngan, Hokkaido University, JapanFollow
Adele Renaud, Université de Rennes 1, France
Stephane Cordier, Université de Rennes 1, France
Maxence Wilmet, Université de Rennes 1, France
Benjamin . Dierre, Laboratory for Innovative Key Materials and Structures (LINK), National Institute of Material Science, Japan
Fabien Grasset, Laboratory for Innovative Key Materials and Structures (LINK), National Institute of Material Science, Japan
Naoki Ohashi, Laboratory for Innovative Key Materials and Structures (LINK), National Institute of Material Science, Japan
Tetsuo Uchikoshi, Research Center for Functional Materials, National Institute for Materials Science, Japan

Conference Dates

October 1-6, 2017

Abstract

The octahedral Ta₆Br₁₄.8H₂O cluster, one of the [M₆Lⁱ₁₂L^a₆]^n- octahedrons (M= Nb, Ta; Lⁱ= halogen, L^a= halogen or chalcogen), exhibits interesting oxido-reduction properties in solution¹. The application of the [Ta₆Brⁱ₁₂]²⁺ cores has been potentially studied in biotechnologies², optical devices³, photovoltaic cells⁴ and catalysis⁵. Originating from the expectation to block the UV and NIR light on low-emissivity window, the Ta₆Br₁₄.8H₂O cluster thin film on ITO glass has been fabricated by electrophoretic deposition (EPD) process, a fairly rapid and low cost two-step process well-known for ceramic shaping, conductive surface coating and easily scalable to industrial level. The interesting characteristic has been recognized that the green [Ta₆Brⁱ₁₂]²⁺ cores (adsorbing Ultra-Visible range) easily transfers to brown [Ta₆Brⁱ₁₂]^3+/4+ cores (absorbing near-infrared range) when dissolved in different solvents. Therefore, selecting the medium and optimizing the concentration of water in solvent to obtain the green homogeneous suspension with high dissolution is the main purpose of study. Considering the green color and transmittance of solution, as well as FE-SEM surface morphology of the green film, 0.02 mL H₂O per mL acetone was selected as the optimal ratio to obtain the green transparent suspension and possibility to fabricate the green film by EPD process. However, the [Ta₆Brⁱ₁₂]²⁺ green film has been essentially incorporated with poly vinyl pyrrolidone (PVP) in order to improve the dispersion of Ta₆Br₁₄.8H₂O clusters inside the suspension and effectively prevent the performance of new [Ta₆Brⁱ₁₂]^3+/4+ clusters (brown-color) by oxidizing reactions.

Reference

[1] A. Vogler et al., Inorg. Chem., 1983, 23 (10), 1360.

[2] J. Knablein et al., J. Mol. Biol., 1997, 270, 1.

[3] S. Cordier et al., J. Inorg. Organomet. Polym., 2015, 25, 189.

[4] A. Renaud et al., Chemistry Select., 2016, 1, 2284.

[5] A. Barras et al., Appl. Catal. B: Environ., 2012, 123, 1

Recommended Citation

Nguyen Thi Kim Ngan, Adele Renaud, Stephane Cordier, Maxence Wilmet, Benjamin . Dierre, Fabien Grasset, Naoki Ohashi, and Tetsuo Uchikoshi, "Fabrication of Octahedral Tantalum Cluster Film by Electrophoretic Deposition" in "Electrophoretic Deposition VI: Fundamentals and Applications", Aldo R. Boccaccini, Institute of Biomaterials, University of Erlangen-Nuremberg, Germany Omer van der Biest, Department of Metallurgy and Materials Engineering, Katholieke Universiteit Leuven, Belgium James Dickerson, Consumer Reports, USA Tetsuo Uchikoshi, National Institute for Materials Science, Japan Eds, ECI Symposium Series, (2017). https://dc.engconfintl.org/electrophoretic_vi/22