Modeling and preparation of practical optical filters

Asghar, Muhammad; Shoaib, Muhammad; Placido, Frank; Naseem, Shahzad

doi:10.1016/j.cap.2008.11.007

Cited by 29 publications

(13 citation statements)

References 9 publications

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“…The schematic representation of the photoinduced phenol decomposition process is shown in Figure 9. We suggest that the photo-induced electrons are being transferred to 4 …”

Section: Resultsmentioning

confidence: 99%

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Photocatalytic properties of transparent TiO2 coatings doped with neodymium

Wojcieszak

Kaczmarek

Domaradzki

et al. 2012

Polish Journal of Chemical Technology

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In this work photocatalytic properties of TiO 2 thin fi lms doped with 8.51 at. % of Nd were described. The self-cleaning phenomenon of thin fi lms was discussed together with the structural, optical and surface properties of prepared thin fi lms. Transparent coatings based on titanium dioxide were manufactured by high-energy reactive magnetron sputtering process. Incorporation of Nd during sputtering process results in amorphous behavior, without a signifi cant infl uence on transparency and colour as compared to the undoped TiO 2 -rutile matrix. Nevertheless, doping with neodymium doubles the photocatalytic activity of the matrix due to higher quantity of photo-generated charge carriers and more effi cient mechanism of energy transfer.

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“…The schematic representation of the photoinduced phenol decomposition process is shown in Figure 9. We suggest that the photo-induced electrons are being transferred to 4 …”

Section: Resultsmentioning

confidence: 99%

“…The properties of TiO 2 can be modifi ed by selection of deposition parameters, doping with different elements or post-process treatment (i.e. annealing) [1][2][3][4][5][6] . By doping with rare earth elements thin fi lms, which exhibit photoluminescence or have high photocatalytic activity can be manufactured…”

Section: -5mentioning

confidence: 99%

Photocatalytic properties of transparent TiO2 coatings doped with neodymium

Wojcieszak

Kaczmarek

Domaradzki

et al. 2012

Polish Journal of Chemical Technology

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“…A phenomenon of photocatalytic water splitting on a TiO 2 electrode under ultra-violet (UV) light was discovered [59][60][61][62], which gave new hope in helping ease energy crises through effective utilization of solar energy in photovoltaic and water-splitting devices [63][64][65]. Transparent thin films based on TiO 2 are widely applied in the coating industry for preparation of hydrophobic or hydrophilic films, self-cleaning coatings, optical filters, and protective films [48,51,54,55,[66][67][68].…”

Section: Introductionmentioning

confidence: 99%

“…TiO 2 is a versatile material that has been used in many applications, such as gas sensors, solar cells, photocatalytic layers for self-cleaning glass, photocatalytic degradation of organic wastes, hydrogen production, storage media, optical coatings for filters and waveguides, and various biological-and health-related applications [47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62][63][64][65][66]. Since the early twentieth century, titanium dioxide (TiO 2 ) has been widely used as a pigment in sunscreens, paints, ointments, toothpaste, etc.…”

Section: Introductionmentioning

confidence: 99%

Recent developments in TiO2 as n- and p-type transparent semiconductors: synthesis, modification, properties, and energy-related applications

2015

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TiO 2 -based thin films and nanomaterials have been fabricated via physical and solution-based techniques by various research groups around the globe. Generally, most applications of TiO 2 involve photocatalytic activity for water and air purification, self-cleaning surfaces, antibacterial activity, and superhydrophilicity. As a widebandgap semiconductor, modified TiO 2 belongs to a class of materials called transparent semiconducting oxides (TSOs), which are simultaneously optically transparent and electrically conductive. TSOs continue to be in high demand for a variety of applications ranging from transparent electronics and sensor devices to light detecting and emitting devices in telecommunications. However, reports on TiO 2 applications as an effective TSO for transparent electronics applications have been limited. In general, TiO 2 is intrinsically an n-type semiconductor but can be doped to have p-type semiconductivity. This provides a very important opportunity to fabricate all-transparent homojunction devices for light harvesting and energy storage. P-type TSOs have recently attracted tremendous interest in the field of active devices for emerging transparent electronics for potential use in ultra-violet light-based solar cells. Therefore, a detailed overview of the synthesis, band structure modification via doping, properties, and applications of modified TiO 2 as n-and p-type TSOs is warranted. This article comprehensively reviews the latest developments. The discussion includes solution-based wet chemical techniques and vacuum-based dry physical techniques fabricating TiO 2 -TSOs. The synthesis of p-TiO 2 in particular is discussed in detail as it may provide interesting breakthroughs in emerging transparent electronics applications. Also, the structural, optical, and electrical properties of TiO 2 are discussed in the context of TSO applications, specifically the defect chemistry of TiO 2 to obtain n-and p-type semiconductivity, which could provide interesting insights into the band structure engineering of TiO 2 for conductivity reversal. Applications of both nand p-type TiO 2 have been reviewed in detail in relation to thin film transparent homo/heterojunction devices, dyesensitized solar cells, electrochromic displays, and other energy-related applications.

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“…There are two main kinds of filters according to the mechanism of filtration, the interference filters which are work by selective reflection and transmittance and absorption filters which are work by selective absorption and transmittance [1]. The interference filters need high technology of fabrication [2] while the absorption filters can be fabricated from glass using the melt-quench method [3,4]. 3d transition metals ions (V, Cr, Mn, Fe, Co, Ni and Cu) giving rise to intense absorption in the visible and near infrared region [3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%