scholarly journals Porphyrin-Functionalized Zinc Oxide Nanostructures for Sensor Applications

Sensors ◽  
2018 ◽  
Vol 18 (7) ◽  
pp. 2279 ◽  
Author(s):  
Mohammad Ekrami ◽  
Gabriele Magna ◽  
Zahra Emam-djomeh ◽  
Mohammad Saeed Yarmand ◽  
Roberto Paolesse ◽  
...  
Keyword(s):  
Hybrid Materials ◽  
Mechanical Energy ◽  
Dye Sensitized Solar Cells ◽  
Wide Band ◽  
Oxide Semiconductor ◽  
Zinc Oxide Nanostructures ◽  
Wide Band Gap ◽  
Sensing Properties ◽  
Sensor Applications ◽  
Zinc Oxides

Hybrid materials made of wide band gap semiconductors and dye molecules are largely studied mainly for photovoltaic applications. However, these materials also show interesting chemical sensitivity. Zinc oxides (ZnO) and porphyrins are good examples of a metal oxide semiconductor and a dye molecule that give rise to a hybrid material with such interesting properties. ZnO has been studied for sensors, optoelectronics, electronic devices, photo-anodes for dye-sensitized solar cells, and for mechanical energy harvesting. Porphyrins, on the other side, can be synthesized in order to mimic their roles in living systems such as oxygen transport and charge transfer for catalytic processes in animals and photosynthesis in plants. This paper provides a review of the chemical sensing properties of porphyrin-capped ZnO nanostructures. The methodologies to functionalize the ZnO surface with porphyrins are illustrated with emphasis on the relationships between the material preparation and its sensing properties. The development of sensors is described through the application of the hybrid materials to different transducers.

Structural and Electrical Properties of Hydrothermal Growth ZnO Nanorods

2015 ◽  
Vol 1109 ◽  
pp. 104-107
Author(s):  
K.L. Foo ◽  
U. Hashim ◽  
Chun Hong Voon ◽  
M. Kashif
Keyword(s):  
Electrical Properties ◽  
Zno Nanorods ◽  
Wide Band ◽  
Hydrothermal Growth ◽  
Oxide Semiconductor ◽  
Wide Band Gap ◽  
Interdigitated Electrode ◽  
Growth Technique ◽  
Xrd Pattern ◽  
Structural And Electrical Properties

ZnO nanorods, type of the metal-oxide semiconductor deposited on interdigitated electrode (IDE) substrate using hydrothermal growth technique. The growth ZnO nanorods was annealed in furnace at 500°C for 2 hours as to obtain highly crystallite of ZnO nanorods. XRD pattern indicated the synthesized ZnO nanorods have preferred orientation along the (002) plane. Moreover, FESEM images showed that the nanorods with the size less than 60 nanometer were successfully synthesized using hydrothermal growth technique. The investigation on optical properties using UV-Vis-NIR spectrophotometer confirmed ZnO is classified as a wide band gap semiconductor material. Furthermore, the growth ZnO nanorods which undergo electrical properties testing using dielectric analyzer and source meter show that the ZnO nanorods demonstrated rectifying behaviour.

EPR Study of the Role of Hydrogen in the Defect Formation Upon Heat Treatment of Oxidized SiC

1998 ◽  
Vol 513 ◽  
Author(s):  
P. J. Macfarlane ◽  
M. E. Zvanut
Keyword(s):  
Heat Treatment ◽  
Defect Formation ◽  
Wide Band ◽  
Oxide Semiconductor ◽  
Wide Band Gap ◽  
Paramagnetic Resonance ◽  
Hydrogen Incorporation ◽  
Si Substrates ◽  
Mos Devices ◽  
Dry Heat Treatment

ABSTRACTFor the past several years hydrogen incorporation in metal oxide semiconductor (MOS) devices has been of interest because studies have shown that vacuum annealing of oxidized Si substrates desorbs hydrogen, revealing interfacial defects. Today, in applications that require higher power and/or temperature, Si will likely be replaced with a wide-band-gap semiconductor. For MOS devices, SiC is a leading contender because it can be thermally oxidized to form a SiO2 insulating layer similar to Si. However, the SiC/SiO2 structure potentially contains hydrogen sensitive centers similar to those found in Si/SiO2 structures. Using electron paramagnetic resonance (EPR), we have observed a center 1.8 G wide peak-to-peak at g=2.0026. The center is generated in oxidized SiC that has received a 900° C dry, N2 or O2, post oxidation heat-treatment in which moisture is measured to be less than 1 ppm. Annealing at 900° C in standard Ar containing at least 50 ppm H2O decreases the center's concentration by two orders of magnitude. By comparing results from our study to studies of Si-H and C-H bonds in a-SiC:H [1] and SiC converted graphite [2], we suggest that this center is related to carbon dangling bonds created by the effusion of hydrogen during the dry heat-treatment. We will compare the activation energy for the hydrogen depassivation of our center with that found for other C-H and Si-H systems.

Effect of Photoanodes on the Performance of Dye-Sensitized Solar Cells

2020 ◽  
Vol 15 (3) ◽  
pp. 62-68
Author(s):  
Suman Chatterjee ◽  
Indra Bahadur Karki
Keyword(s):  
Density Functional ◽  
Breakdown Strength ◽  
Photovoltaic Performance ◽  
Dye Sensitized Solar Cells ◽  
Wide Band ◽  
Electrical Energy ◽  
Vital Role ◽  
Wide Band Gap ◽  
Dye Sensitized ◽  
Device Properties

Dye sensitized Solar cell (DSSC) is a photo-electrochemical system which converts solar energy into electrical energy. In the present era DSSCs takes so much attention because of their considerably high efficiencies at a comparably low production cost. The nanostructured electrode plays a vital role in device properties. Originally, the nanostructured TiO2 were widely used as DSSC electrodes. Further, nanostructured ZnO has shown a great deal of research interest as the electrode material in DSSCs due to some of its fascinating properties. Compared to other semiconductors, it has unique properties such as large exciton binding energy, wide band gap, high breakdown strength, cohesion and exciton stability. In this paper, the construction and electron transport mechanism of DSSCs devices are described and a comparison of performances of DSSCs fabricated with ZnO or TiO2 photo electrodes was made in terms of its device parameters. This is further correlated with the band structure & density of states (DOS) of ZnO and TiO2 using Density functional theory (DFT) and finally the photovoltaic performance of ZnO and TiO2 based DSSCs was discussed to elucidate the differences.

Direct observation of electronic transition–plasmon coupling for enhanced electron injection in dye-sensitized solar cells

RSC Advances ◽  
2016 ◽  
Vol 6 (101) ◽  
pp. 98753-98760 ◽  
Author(s):  
Prasenjit Kar ◽  
Tuhin Kumar Maji ◽  
Probir Kumar Sarkar ◽  
Samim Sardar ◽  
Samir Kumar Pal
Keyword(s):  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Dye Sensitized Solar Cells ◽  
Wide Band ◽  
Electron Injection ◽  
Plasmon Coupling ◽  
Wide Band Gap ◽  
Dye Sensitized ◽  
Sensitized Solar Cells ◽  
Effect Of Surface

We illustrate experimental evidence of the effect of surface plasmon resonance (SPR) of a noble metal on the ultrafast-electron injection efficiencies of a sensitizing dye in proximity of a wide band gap semiconductor.

scholarly journals Photostable electroactive polymer based nanocomposite films for the protection of mild steel from corrosion

2021 ◽  
pp. 096739112098650
Author(s):  
I Pugazhenthi ◽  
S Mohammed Safiullah ◽  
K Anver Basha
Keyword(s):  
Mild Steel ◽  
Band Gap ◽  
Hybrid Materials ◽  
Hybrid Film ◽  
Wide Band ◽  
Electroactive Polymer ◽  
Nanocomposite Films ◽  
Butyl Methacrylate ◽  
Wide Band Gap ◽  
Uv Blocking

The deterioration of organic film due to chemical and UV attack is an increasing concern in paint technology. Thus, the development of new material for UV blocking anticorrosive film draws significant attention in materials science research. This can be achieved by the incorporation of wide band gap nanoparticles like titania (TiO2NPs) and zirconia (ZrO2NPs) in electroactive polymer namely poly(pyridine-4-yl-methyl) methacrylate-co-butyl methacrylate (poly(PyMMA-co-BMA)) film (hybrid film) for the protection of mild steel (MS) from corrosion. The TiO2NPs and ZrO2NPs in combination with polymer absorb more UV light which prevents the deterioration of film. The hybrid material made of poly(PyMMA-co-BMA) and wide band gap nanoparticles was prepared by in situ solution polymerization. The resultant hybrid materials were characterized by various techniques namely X-ray diffraction studies (XRD) and transmission electron microscopy (TEM). The hybrid materials were deposited as film on the MS by spin coating method. The anticorrosive performance of hybrid films was analysed out using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) studies. The surface examination of films were characterized with scanning electron microscope to confirm the formation of poly(PyMMA-co-BMA) and its different nanocomposite films on MS. The UV blocking studies were also carried out using UV-visible spectroscopy. The electrochemical and optical studies reveals that the poly(PyMMA-co-BMA)/TiO2 film on MS in 3.5% (w/v) NaCl provides better protection against corrosion than ZrO2 based nanocomposite hybrid film.

scholarly journals Near-IR sensitization of wide band gap oxide semiconductor by axially anchored Si-naphthalocyanines

2009 ◽  
Vol 2 (5) ◽  
pp. 529 ◽  
Author(s):  
Lorena Macor ◽  
Fernando Fungo ◽  
Tomas Tempesti ◽  
Edgardo N. Durantini ◽  
Luis Otero ◽  
...  
Keyword(s):  
Band Gap ◽  
Wide Band ◽  
Oxide Semiconductor ◽  
Wide Band Gap ◽  
Near Ir

Halide‐Modulated Functionality of Wide Band Gap Zinc Oxide Semiconductor Nanoparticle

2018 ◽  
Vol 3 (23) ◽  
pp. 6382-6393 ◽  
Author(s):  
Tuhin Kumar Maji ◽  
Prasenjit Kar ◽  
Harahari Mandal ◽  
Chinmoy Bhattacharya ◽  
Debjani Karmakar ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Band Gap ◽  
Wide Band ◽  
Oxide Semiconductor ◽  
Wide Band Gap ◽  
Semiconductor Nanoparticle
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