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  • 1. Baruah, Sunandan
    et al.
    Mahmood, M. A.
    Myint, M. T. Z.
    Bora, T.
    Dutta, Joydeep
    School of Advanced Technologies, Asian Institute of Technology, Thailand.
    Enhanced visible light photocatalysis through fast crystallization of zinc oxide nanorods2010In: Beilstein Journal of Nanotechnology, ISSN 2190-4286, Vol. 1, no 1, p. 14-20Article in journal (Refereed)
    Abstract [en]

    Hydrothermally grown ZnO nanorods have inherent crystalline defects primarily due to oxygen vacancies that enhance optical absorption in the visible spectrum, opening up possibilities for visible light photocatalysis. Comparison of photocatalytic activity of ZnO nanorods and nanoparticle films on a test contaminant methylene blue with visible light irradiation at 72 kilolux (klx) showed that ZnO nanorods are 12–24% more active than ZnO nanoparticulate films. This can be directly attributed to the increased effective surface area for adsorption of target contaminant molecules. Defects, in the form of interstitials and vacancies, were intentionally created by faster growth of the nanorods by microwave activation. Visible light photocatalytic activity was observed to improve by ≈8% attributed to the availability of more electron deficient sites on the nanorod surfaces. Engineered defect creation in nanostructured photocatalysts could be an attractive solution for visible light photocatalysis.

  • 2. Bora, T.
    et al.
    Kyaw, H. H.
    Sarkar, S.
    Pal, S. K.
    Dutta, Joydeep
    School of Engineering and Technology, Asian Institute of Technology, Thailand.
    Highly efficient ZnO/Au Schottky barrier dye-sensitized solar cells: Role of gold nanoparticles on the charge-transfer process2011In: Beilstein Journal of Nanotechnology, ISSN 2190-4286, Vol. 2, no 1, p. 681-690Article in journal (Refereed)
    Abstract [en]

    Zinc oxide (ZnO) nanorods decorated with gold (Au) nanoparticles have been synthesized and used to fabricate dye-sensitized solar cells (DSSC). The picosecond-resolved, time-correlated single-photon-count (TCSPC) spectroscopy technique was used to explore the charge-transfer mechanism in the ZnO/Au-nanocomposite DSSC. Due to the formation of the Schottky barrier at the ZnO/Au interface and the higher optical absorptions of the ZnO/Au photoelectrodes arising from the surface plasmon absorption of the Au nanoparticles, enhanced power-conversion efficiency (PCE) of 6.49% for small-area (0.1 cm(2)) ZnO/Au-nanocomposite DSSC was achieved compared to the 5.34% efficiency of the bare ZnO nanorod DSSC. The TCSPC studies revealed similar dynamics for the charge transfer from dye molecules to ZnO both in the presence and absence of Au nanoparticles. A slower fluorescence decay associated with the electron recombination process, observed in the presence of Au nanoparticles, confirmed the blocking of the electron transfer from ZnO back to the dye or electrolyte by the Schottky barrier formed at the ZnO/Au interface. For large area DSSC (1 cm(2)), similar to 130% enhancement in PCE (from 0.50% to 1.16%) was achieved after incorporation of the Au nanoparticles into the ZnO nanorods.

  • 3. Bora, Tanujjal
    et al.
    Lakshman, Karthik K
    Sarkar, Soumik
    Makhal, Abhinandan
    Sardar, S.
    Pal, S. K.
    Dutta, Joydeep
    School of Engineering and Technology, Asian Institute of Technology, Thailand.
    Modulation of defect-mediated energy transfer from ZnO nanoparticles for the photocatalytic degradation of bilirubin2013In: Beilstein Journal of Nanotechnology, ISSN 2190-4286, Vol. 4, no 1, p. 714-725Article in journal (Refereed)
    Abstract [en]

    In recent years, nanotechnology has gained significant interest for applications in the medical field. In this regard, a utilization of the ZnO nanoparticles for the efficient degradation of bilirubin (BR) through photocatalysis was explored. BR is a water insoluble byproduct of the heme catabolism that can cause jaundice when its excretion is impaired. The photocatalytic degradation of BR activated by ZnO nanoparticles through a non-radiative energy transfer pathway can be influenced by the surface defect-states (mainly the oxygen vacancies) of the catalyst nanoparticles. These were modulated by applying a simple annealing in an oxygen-rich atmosphere. The mechanism of the energy transfer process between the ZnO nanoparticles and the BR molecules adsorbed at the surface was studied by using steady-state and picosecond-resolved fluorescence spectroscopy. A correlation of photocatalytic degradation and time-correlated single photon counting studies revealed that the defect-engineered ZnO nanoparticles that were obtained through post-annealing treatments led to an efficient decomposition of BR molecules that was enabled by Forster resonance energy transfer.

  • 4.
    Borysov, Stanislav S.
    et al.
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
    Forchheimer, Daniel
    KTH, School of Engineering Sciences (SCI), Applied Physics, Nanostructure Physics.
    Haviland, David B.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Nanostructure Physics.
    Dynamic calibration of higher eigenmode parameters of a cantilever in atomic force microscopy by using tip-surface interactions2014In: Beilstein Journal of Nanotechnology, ISSN 2190-4286, Vol. 5, p. 1899-1904Article in journal (Refereed)
    Abstract [en]

    We present a theoretical framework for the dynamic calibration of the higher eigenmode parameters (stiffness and optical lever inverse responsivity) of a cantilever. The method is based on the tip-surface force reconstruction technique and does not require any prior knowledge of the eigenmode shape or the particular form of the tip-surface interaction. The calibration method proposed requires a single-point force measurement by using a multimodal drive and its accuracy is independent of the unknown physical amplitude of a higher eigenmode.

  • 5. Erlingsson, S. I.
    et al.
    Bardarson, Jens Hjörleifur
    KTH, School of Engineering Sciences (SCI), Physics.
    Manolescu, A.
    Thermoelectric current in topological insulator nanowires with impurities2018In: Beilstein Journal of Nanotechnology, ISSN 2190-4286, Vol. 9, no 1, p. 1156-1161Article in journal (Refereed)
    Abstract [en]

    In this paper we consider charge current generated by maintaining a temperature difference over a nanowire at zero voltage bias. For topological insulator nanowires in a perpendicular magnetic field the current can change sign as the temperature of one end is increased. Here we study how this thermoelectric current sign reversal depends on the magnetic field and how impurities affect the size of the thermoelectric current. We consider both scalar and magnetic impurities and show that their influence on the current are quite similar, although the magnetic impurities seem to be more effective in reducing the effect. For moderate impurity concentration the sign reversal persists.

  • 6. Jaisai, Mayuree
    et al.
    Baruah, Sunandan
    Dutta, Joydeep
    Asian Institute of Technology, Thailand; Sultan Qaboos University, Oman.
    Paper modified with ZnO nanorods–antimicrobial studies2012In: Beilstein Journal of Nanotechnology, ISSN 2190-4286, Vol. 3, no 1, p. 684-691Article in journal (Refereed)
    Abstract [en]

    Paper with antimicrobial properties was developed through in situ growth of ZnO nanorods. The targeted application for this type of paper is in health centers as wallpaper, writing paper, facemasks, tissue paper, etc. The paper was tested on three model microbes, Gram-positive bacteria Staphylococcus aureus, Gram-negative bacteria Escherichia coli and common airborne fungus Aspergillus niger. No viable bacterial colonies or fungal spores could be detected in the areas surrounding test samples of the antimicrobial paper. Gram-negative bacteria Escherichia coli were found to be inhibited in an area that is 239% and 163% the area of the paper sample under different room lighting conditions, i.e., halogen and fluorescent lamp illumination, respectively. For Gram-positive bacteria Staphylococcus aureus the zones of inhibition surrounding the paper samples are 102% and 70%, and for Aspergillus niger, 224% and 183% of the sample area, under similar lighting conditions.

  • 7. Kyaw, Htet H.
    et al.
    Al-Harthi, Salim H.
    Sellai, Azzouz
    Dutta, Joydeep
    KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Functional Materials, FNM.
    Self-organization of gold nanoparticles on silanated surfaces2015In: Beilstein Journal of Nanotechnology, ISSN 2190-4286, Vol. 6, p. 2345-2353Article in journal (Refereed)
    Abstract [en]

    The self-organization of monolayer gold nanoparticles (AuNPs) on 3-aminopropyltriethoxysilane (APTES)-functionalized glass substrate is reported. The orientation of APTES molecules on glass substrates plays an important role in the interaction between AuNPs and APTES molecules on the glass substrates. Different orientations of APTES affect the self-organization of AuNps on APTES-functionalized glass substrates. The as grown monolayers and films annealed in ultrahigh vacuum and air (600 degrees C) were studied by water contact angle measurements, atomic force microscopy, X-ray photoelectron spectroscopy, UV-visible spectroscopy and ultraviolet photoelectron spectroscopy. Results of this study are fundamentally important and also can be applied for designing and modelling of surface plasmon resonance based sensor applications.

  • 8.
    Loiko, Pavel
    et al.
    ITMO Univ, Kronverkskiy Pr 49, St Petersburg 197101, Russia..
    Bora, Tanujjal
    Sultan Qaboos Univ, Chair Nanotechnol, Water Res Ctr, POB 17, Muscat 123, Oman.;Asian Inst Technol, Sch Engn & Technol, Nanotechnol, POB 4, Klongluang 12120, Pathumthani, Thailand..
    Serres, Josep Maria
    URV, Dept Quim Fis & Inorgan, Fis & Cristallog Mat & Nanomat FiCMA FiCNA EMaS, Campus Sescelades, Tarragona 43007, Spain..
    Yu, Haohai
    Shandong Univ, State Key Lab Crystal Mat, Jinan 250100, Shandong, Peoples R China.;Shandong Univ, Inst Crystal Mat, Jinan 250100, Shandong, Peoples R China..
    Aguio, Magdalena
    URV, Dept Quim Fis & Inorgan, Fis & Cristallog Mat & Nanomat FiCMA FiCNA EMaS, Campus Sescelades, Tarragona 43007, Spain..
    Diaz, Francesc
    URV, Dept Quim Fis & Inorgan, Fis & Cristallog Mat & Nanomat FiCMA FiCNA EMaS, Campus Sescelades, Tarragona 43007, Spain..
    Griebner, Uwe
    Max Born Inst Nonlinear Opt & Short Pulse Spect, Max Born Str 2a, D-12489 Berlin, Germany..
    Petrov, Valentin
    Max Born Inst Nonlinear Opt & Short Pulse Spect, Max Born Str 2a, D-12489 Berlin, Germany..
    Mateos, Xavier
    URV, Dept Quim Fis & Inorgan, Fis & Cristallog Mat & Nanomat FiCMA FiCNA EMaS, Campus Sescelades, Tarragona 43007, Spain..
    Dutta, Joydeep
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Oriented zinc oxide nanorods: A novel saturable absorber for lasers in the near-infrared2018In: Beilstein Journal of Nanotechnology, ISSN 2190-4286, Vol. 9, p. 2730-2740Article in journal (Refereed)
    Abstract [en]

    Zinc oxide (ZnO) nanorods (NRs) oriented along the crystallographic [001] axis are grown by the hydrothermal method on glass substrates. The ZnO NRs exhibit a broadband (1-2 mu m) near-IR absorption ascribed to the singly charged zinc vacancy V-z(n)-1. The saturable absorption of the ZnO NRs is studied at approximate to 1 mu m under picosecond excitation, revealing a low saturation intensity, approximate to 10 kW/cm(2), and high fraction of the saturable losses. The ZnO NRs are applied as saturable absorbers in diode-pumped Yb (approximate to 1.03 mu m) and Tm (approximate to 1.94 mu m) lasers generating nanosecond pulses. The ZnO NRs grown on various optical surfaces are promising broadband saturable absorbers for nanosecond near-IR lasers in bulk and waveguide geometries.

  • 9.
    Platz, Daniel
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Nanostructure Physics.
    Forchheimer, Daniel
    KTH, School of Engineering Sciences (SCI), Applied Physics, Nanostructure Physics.
    Tholén, Erik A.
    Haviland, David B.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Nanostructure Physics.
    Polynomial force approximations and multifrequency atomic force microscopy2013In: Beilstein Journal of Nanotechnology, ISSN 2190-4286, Vol. 4, no 1, p. 352-360Article in journal (Refereed)
    Abstract [en]

    We present polynomial force reconstruction from experimental intermodulation atomic force microscopy (ImAFM) data. We study the tip-surface force during a slow surface approach and compare the results with amplitude-dependence force spectroscopy (ADFS). Based on polynomial force reconstruction we generate high-resolution surface-property maps of polymer blend samples. The polynomial method is described as a special example of a more general approximative force reconstruction, where the aim is to determine model parameters that best approximate the measured force spectrum. This approximative approach is not limited to spectral data, and we demonstrate how it can be adapted to a force quadrature picture.

1 - 9 of 9
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