Chemical bonding states and solar selective characteristics of unbalanced magnetron sputtered TixM1−x−yNyfilms

M. Mahbubur Rahman, Zhong-Tao Jiang, Paul Munroe, Lee Siang Chuah, Zhi-feng Zhou, Zonghan Xie, Chun Yang Yin, Khalil Ibrahim, Amun Amri, Humayun Kabir, Md Mahbubul Haque, Nick Mondinos, Mohammednoor Altarawneh, Bogdan Z. Dlugogorski

    Research output: Contribution to journalArticle

    Abstract

    Transition metal nitride TixM1−x−yNy (M = Al or AlSi) based thin films are evaluated as solar selective surfaces by correlating their spectral selective features with their crystal structure and chemical bonding state including mechanical strength. Ti0.5N0.5, Ti0.25Al0.25N0.5, and Ti0.25Al0.2Si0.05N0.5 films were synthesized on AISI M2 steel substrates via closed field unbalanced magnetron sputtering technology. These were investigated using XRD, SEM, XPS, UV-Vis, FTIR and nanoindentation techniques. Analysis of the optical properties showed the solar absorptance, in the visible range, of the TixM1−x−yNy films improved significantly from 51% to 81% with AlSi-doping and an increase of solar absorptance of up to 66% was recorded from films doped with Al. Moreover, the Al doping can reduce the thermal emittance in the infrared range from 6.06% to 5.11%, whereas doping with AlSi reduces the emittance to ca. 3.58%. The highest solar selectivity of 22.63 was achieved with TiAlSiN films. Mechanical studies showed enhanced hardness by ∼32%; enhanced yield strength by ∼16% and enhanced plastic deformation by ∼110% of Al and AlSi doped TiN matrix.
    Original languageEnglish
    Journal RSC Advances
    Volume43
    DOIs
    Publication statusSubmitted - 1 Jan 2016

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