scholarly journals Photocurrent Enhancement of PtSe2 Photodetectors by Using Au Nanorods

Photonics ◽  
2021 ◽  
Vol 8 (11) ◽  
pp. 505
Author(s):  
Tatsuya Nakazawa ◽  
Donghyun Kim ◽  
Shinichi Kato ◽  
Jusang Park ◽  
Jwamin Nam ◽  
...  
Keyword(s):  
Near Infrared ◽  
Infrared Region ◽  
Photochemical Reactions ◽  
Infrared Light ◽  
Localized Surface Plasmon ◽  
Transition Metal Dichalcogenide ◽  
Light Detection ◽  
Au Nanorods ◽  
Extinction Peak ◽  
Near Infrared Region

Compact and highly sensitive near-infrared photodetectors that are operable at room temperature are required for light detection and ranging and medical devices. Two-dimensional (2D) PtSe2, a transition metal dichalcogenide, is a candidate material for near-infrared light detection. However, the photoresponse properties of 2D PtSe2 are currently inferior to those of commercial materials. The localized surface plasmon resonance of Au has been widely used for photoelectric field enhancement and in photochemical reactions associated with phase relaxation from plasmon states that occur at specific wavelengths. Spherical Au nanocolloids exhibit an extinction peak in the visible light region, whereas nanorods can be tuned to exhibit the extinction peak in the near-infrared region by controlling their aspect ratio. In this study, hybrid Au nanorod/2D PtSe2 structure was fabricated via spin coating nanorods, with plasmon peaks in the near-infrared region, on 2D PtSe2. Furthermore, the effect of the concentration of the nanorod solution on the photoresponse of nanorod/2D PtSe2 was investigated. The photocurrent of 5 nM Au nanorod-coated 2D PtSe2 was fivefold higher than that of bare 2D PtSe2. The responsivity was maximum 908 μW/A at 0.5 V bias voltage. In addition, the photocurrent enhancement mechanism by Au nanorods is discussed.

scholarly journals Precise Control of Copper-Localized Surface Plasmon Resonance in the Near Infrared Region for Enhancement of Up-Conversion Luminescence

Metals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 628
Author(s):  
Yuyong Pan ◽  
Lingling Chu ◽  
Jiliang Liu ◽  
Baize Lv ◽  
Laurence A. Belfiore ◽  
...  
Keyword(s):  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Fluorescence Intensity ◽  
Plasmon Resonance ◽  
Nanocomposite Film ◽  
Near Infrared ◽  
Copper Film ◽  
Infrared Region ◽  
Localized Surface Plasmon ◽  
Near Infrared Region

The surface plasmon resonance of copper in the near infrared region provides a novel method for enhancement of up-conversion luminescence compared to using gold and silver, as the former grants significant cost savings. In this study, we made a flat Cu film covered TiO2 to enhance the up-conversion fluorescence intensity. The results show that the deposition of copper/TiO2 dioxide nanocomposite film prepared via spin-coating has no effect on the structure of NaGdF4:Er3+, Yb3+. The absorption wavelength of the copper film moved from the original visible wavelength (~600 nm) range to the infrared wavelength after covering TiO2, and most obviously, the copper film covered two layers of TiO2 by about 16 nm; the peak of the absorption appeared at 835 nm due to the enhanced excitation field. The behavior of the nanocomposite film with NaGdF4:Er3+ and Yb3+ under 980 nm excitation was investigated; it provides a novel way for studying mental-enhanced fluorescence. Besides, the peaks of the fluorescence spectrum show different emissions at 542 nm and 660 nm, respectively. The copper nanoparticles-covered TiO2 layer can obviously enhance the fluorescence intensity, and the maximum enhancement factors of emission of NaGdF4:Er3+ and Yb3+ nanoparticles are 3.1 and 1.9 on the nanocomposite film, respectively.

Preparation of the W18O49/g-C3N4 heterojunction catalyst with full-spectrum-driven photocatalytic N2 photofixation ability from the UV to near infrared region

2017 ◽  
Vol 41 (17) ◽  
pp. 8920-8926 ◽  
Author(s):  
Hongyu Liang ◽  
He Zou ◽  
Shaozheng Hu
Keyword(s):  
Quantum Efficiency ◽  
Near Infrared ◽  
Infrared Region ◽  
Infrared Light ◽  
Full Spectrum ◽  
Near Infrared Light ◽  
Light Utilization ◽  
Near Infrared Region

This work provides a strategy to improve the quantum efficiency of photocatalysts by promoting near-infrared light utilization.

Identifying different types of tumors in human brain, breast, and uterus according to their optical properties in the red to near-infrared region

2020 ◽  
Author(s):  
Omnia Hamdy
Keyword(s):  
Human Brain ◽  
Near Infrared ◽  
Biological Tissues ◽  
Infrared Region ◽  
Infrared Light ◽  
Tumor Type ◽  
Significant Information ◽  
Different Types ◽  
Light Diffusion ◽  
Near Infrared Region

AbstractOptical diagnosis techniques are gaining validity due to their competitive advantages including safety and functionality. These methods probe the tissue using light in the red to near-infrared region that shows relatively high penetration in biological tissues. The reflected light which is controlled by tissue absorption and scattering parameters can provide significant information about its pathology. In the present work, a method for identifying different types of tumors in human brain, breast and uterus based on their absorption and scattering characteristics in the red to near-infrared spectra is proposed. The classification method depends on studying the red to near-infrared light diffusion through the examined tissues using Monte-Carlo simulation and finite element solution of the light diffusion equation. The obtained tissue reflectance profiles, optical fluence rate distribution and absorbed faction in each tumor type show different characteristics along the selected wavelengths. The variation in these three features can be considered as an alternative approach of medical diagnosis or can assist with other conventional diagnosis methods.

Ligand Influence Versus Electronic Configuration of d-metal Ion in Determining the Fate of NIR Emission from LnIII Ions: A Case Study with CuII, NiII and ZnII Complexes.

2021 ◽  
Author(s):  
Abhineet Verma ◽  
Sk Saddam Hossain ◽  
Sailaja S Sunkari ◽  
Joseph Reibenspies ◽  
Satyen Saha
Keyword(s):  
Metal Ion ◽  
Selection Rule ◽  
Near Infrared ◽  
Electronic Configuration ◽  
Infrared Region ◽  
Direct Excitation ◽  
Characteristic Emission ◽  
Nir Emission ◽  
Near Infrared Region

Lanthanides (LnIII) are well known for their characteristic emission in the Near-Infrared Region (NIR). However, direct excitation of lanthanides is not feasible as described by Laporte’s parity selection rule. Here,...

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