Dr. Vo-Van Truong Profile

Dr. Vo-Van Truong

Vice Provost Research at Concordia Univ

SPIE Involvement:

Author

Publications (17)

SPIE Journal Paper | 8 December 2016 Open Access

Tungsten oxide–cellulose nanocrystal composite films for electrochromic applications

Stefan Stoenescu, Simona Badilescu, Tanu Sharma, Ralf Brüning, Vo-Van Truong

OE, Vol. 55, Issue 12, 127102, (December 2016) https://doi.org/10.1117/12.10.1117/1.OE.55.12.127102

KEYWORDS: Composites, Tungsten, Oxides, Modulation, Nanocrystals, Nanocomposites, Transmittance, Lithium, Glasses, Hydrogen

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Proceedings Article | 16 September 2016 Presentation + Paper

Ultrathin high-contrast optical modulators for visible and near infrared applications

Alain Haché, Patrick Cormier, Jacques Thibodeau, Alexandre Doucet, Phuong Anh Do, Tran Vinh Son, Vo-Van Truong

Proceedings Volume 9920, 99201Z (2016) https://doi.org/10.1117/12.2237435

KEYWORDS: Vanadium, Optical modulators, Polarization, Phase shifts, Visible radiation, Refractive index, Polarizers, Reflection, Thin films, Dielectric polarization

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Proceedings Article | 25 September 2014 Paper

Effect of symmetry breaking and substrate on the optical properties of silver sphere-like nanoparticles in different surrounding media

Mohammed Alsawafta, Mamoun Wahbeh, Vo-Van Truong

Proceedings Volume 9288, 92881A (2014) https://doi.org/10.1117/12.2086149

KEYWORDS: Nanoparticles, Plasmonics, Absorption, Spherical lenses, Silver, Dielectrics, Dielectric polarization, Optical properties, Plasmons, Polarization

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Proceedings Article | 24 October 2012 Paper

Enhanced anisotropy of gold nanorods-polymer composite films for optical applications

Stefan Stoenescu, Simona Badilescu, Muthukumaran Packirisamy, Vo-Van Truong

Proceedings Volume 8412, 84121T (2012) https://doi.org/10.1117/12.2001172

KEYWORDS: Absorbance, Composites, Polarization, Polymers, Anisotropy, Gold, Scanning electron microscopy, Absorption, Nanocomposites, Nanorods

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Proceedings Article | 23 October 2012 Paper

Gold nanorods on the cathode electrode for enhancing the efficiency of polymer solar cells

Alaa Mahmoud, Neda Etebari Alamdari, Ricardo Izquierdo, Vo-Van Truong

Proceedings Volume 8412, 84121M (2012) https://doi.org/10.1117/12.2001319

KEYWORDS: Solar cells, Gold, Excitons, Polymers, Electrodes, Control systems, Absorption, Surface plasmons, Heterojunctions, Nanorods

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Proceedings Article | 8 September 2011 Paper

Optical properties of two-dimensional and three-dimensional arrays of noble metal nanoparticles by the discrete dipole approximation method

Mamoun Wahbeh, Mohammed Alsawafta, Sushil Misra, Vo-Van Truong

Proceedings Volume 8007, 80071I (2011) https://doi.org/10.1117/12.905102

KEYWORDS: Absorption, Silver, Nanoparticles, Plasmons, Gold, Metals, Copper, Optical spheres, 3D acquisition, Dielectrics

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Proceedings Article | 8 September 2011 Paper

Low density of gold nanorods in the anodic layer for enhancing the efficiency of organic solar cells

Alaa Mahmoud, Jianming Zhang, Jayanta Baral, Ricardo Izquierdo, Dongling Ma, Muthukuraman Packirisamy, Vo-Van Truong

Proceedings Volume 8007, 80071V (2011) https://doi.org/10.1117/12.904055

KEYWORDS: Solar cells, Gold, Glasses, Photovoltaics, Absorption, Control systems, Organic photovoltaics, Heterojunctions, Neodymium, Nanorods

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Proceedings Article | 8 September 2011 Paper

The effect of the target size on the optical response of ultrafine metallic spherical particles arranged in a two-dimensional array

Mohammed Alsawafta, Mamoun Wahbeh, Sushil Misra, Vo-Van Truong

Proceedings Volume 8007, 80071H (2011) https://doi.org/10.1117/12.905099

KEYWORDS: Nanoparticles, Copper, Gold, Surface plasmons, Absorption, Silver, Particles, Metals, Optical spheres, Spherical lenses

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Proceedings Article | 5 August 2009 Paper

Synthesis and optical properties of anisotropic gold nanoparticles

Stefan Stoenescu, Simona Badilescu, Muthukumaran Packirisamy, Vo-Van Truong

Proceedings Volume 7386, 73862V (2009) https://doi.org/10.1117/12.839605

KEYWORDS: Nanoparticles, Scanning electron microscopy, Gold, Particles, Optical properties, Biosensing, Crystals, Glasses, Absorbance, Nanorods

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Proceedings Article | 14 November 1997 Paper

Conducting-polymer-based radar-absorbing materials

Vo-Van Truong, Ben Turner, Richard Muscat, M. Russo

Proceedings Volume 3241, (1997) https://doi.org/10.1117/12.293483

KEYWORDS: Reflectivity, Foam, Polymers, Microwave radiation, Coating, Reflection, Absorption, Dielectrics, Manufacturing, Radar

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Proceedings Article | 30 July 1997 Paper

Ellipsometry as a characterization technique

Vo-Van Truong, Le-quang Nguyen

Proceedings Volume 10291, 102910L (1997) https://doi.org/10.1117/12.279849

KEYWORDS: Ellipsometry, Spectroscopic ellipsometry, Infrared imaging, Infrared spectroscopy, Real time imaging

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Proceedings Article | 23 August 1995 Paper

Transmission and reflection ellipsometry studies of electrochromic materials and devices

George Bader, Pandurang Ashrit, Vo-Van Truong

Proceedings Volume 2531, (1995) https://doi.org/10.1117/12.217354

KEYWORDS: Reflection, Glasses, Oxides, Tungsten, Ellipsometry, Thin films, Multilayers, Absorption, Reflectance spectroscopy, Sensors

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Proceedings Article | 23 August 1995 Paper

Nonideal lithium insertion behavior of sputtered tungsten oxide films

Mark Burdis, John Siddle, A. MacKenzie, Simona Badilescu, P. Richard, Pandurang Ashrit, George Bader, Fernand Girouard, Vo-Van Truong

Proceedings Volume 2531, (1995) https://doi.org/10.1117/12.217323

KEYWORDS: Lithium, Tungsten, Oxides, Metals, Thin films, Oxygen, Mid-IR, Sputter deposition, UV-Vis spectroscopy, Electron beams

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Two sets of WO₃ thin films were prepared by rf sputtering from tungsten oxide and tungsten metal targets, respectively. Lithium insertion studies were carried out in these two types of films. It has been found that the films sputtered from the metal targets showed an irreversible uptake of lithium without any coloration. The aim of the present work is to study this specific behavior of such films in comparison to those deposited from tungsten oxide targets. These films have been studied by thermogravimetry, UV-Vis spectroscopy, electron probe, ellipsometry, and ATR-FTIR spectroscopy. The stoichiometry of both types of films is found to be identical. The ATR-FTIR spectra show a difference in the W-O stretching vibration pattern of the two types of films, clearly indicating structural differences in the as- deposited WO₃ films. However, both types of films show the presence of little or no water in the as-deposited state. Upon the insertion of lithium it is found that the films deposited from the oxide target show the formation of 'bronze' right from the very early stage of insertion as indicated by the blue coloration. This formation is reflected in the ATR-FTIR spectra by the increasing slope of the absorption in the mid-infrared range. Contrary to this behavior, the films deposited from the metal target do not show any coloration in the initial stages of lithium insertion. The infrared spectra corresponding to this behavior show little change in the mid-infrared range. However, a widening of the W-O stretching band is observed in these spectra reflecting a structural reorganization in the films. With continued lithium insertion, however, the behavior in the two types of films becomes similar. Hence, in the initial stages of coloration the quantity of lithium participating in the electrochromic coloration of the films deposited from metal target seems to be lower than in the other types of film. The optical constants of these films have also been determined using reflection- transmission ellipsometry showing important differences in the films. Hence, the electrochromic behavior of sputtered tungsten oxide films depends strongly on the type of deposition.