scholarly journals Laser Photoluminescence Spectroscopy of the Subsurface Microstructure in a Nafion Polymer Membrane in Deuterated Water

2019 ◽  
pp. 48-65 ◽  
Author(s):  
N.F. Bunkin ◽  
Ig.S. Golyak ◽  
Il.S. Golyak ◽  
V.A. Kozlov ◽  
A.E. Primenko ◽  
...  
Keyword(s):  
Ultraviolet Radiation ◽  
Spectral Range ◽  
Grazing Incidence ◽  
Polymer Membrane ◽  
Photoluminescence Spectroscopy ◽  
Nafion Membrane ◽  
Deuterated Water ◽  
Polymer Swelling ◽  
Near Ultraviolet ◽  
Subsurface Microstructure

The paper describes experiments in exposing the surface of a water-swollen Nafion polymer membrane to near ultraviolet radiation at grazing incidence. Ultraviolet radiation caused the surface of the Nafion polymer membrane to photoluminesce in a specific spectral range. This luminescence appears due to the presence of sulphonic acid groups at the ends of perfluorovinyl ether groups that form the polytetrafluoroethylen base of the Nafion membrane. We show that the photoluminescence signal is an important parameter for describing the process of polymer swelling in water

scholarly journals MoS2 Based Photodetectors: A Review

Sensors ◽  
2021 ◽  
Vol 21 (8) ◽  
pp. 2758
Author(s):  
Alberto Taffelli ◽  
Sandra Dirè ◽  
Alberto Quaranta ◽  
Lucio Pancheri
Keyword(s):  
Electric Fields ◽  
Spectral Range ◽  
Performance Metrics ◽  
Transition Metal Dichalcogenides ◽  
Visible Spectral Range ◽  
Detector Performance ◽  
Strong Light ◽  
Near Ultraviolet ◽  
Passivation Layers ◽  
Low Dimensional

Photodetectors based on transition metal dichalcogenides (TMDs) have been widely reported in the literature and molybdenum disulfide (MoS2) has been the most extensively explored for photodetection applications. The properties of MoS2, such as direct band gap transition in low dimensional structures, strong light–matter interaction and good carrier mobility, combined with the possibility of fabricating thin MoS2 films, have attracted interest for this material in the field of optoelectronics. In this work, MoS2-based photodetectors are reviewed in terms of their main performance metrics, namely responsivity, detectivity, response time and dark current. Although neat MoS2-based detectors already show remarkable characteristics in the visible spectral range, MoS2 can be advantageously coupled with other materials to further improve the detector performance Nanoparticles (NPs) and quantum dots (QDs) have been exploited in combination with MoS2 to boost the response of the devices in the near ultraviolet (NUV) and infrared (IR) spectral range. Moreover, heterostructures with different materials (e.g., other TMDs, Graphene) can speed up the response of the photodetectors through the creation of built-in electric fields and the faster transport of charge carriers. Finally, in order to enhance the stability of the devices, perovskites have been exploited both as passivation layers and as electron reservoirs.

Ocular Effects of Near Ultraviolet Radiation

1977 ◽  
Vol 54 (8) ◽  
pp. 542-559 ◽  
Author(s):  
DONALD G. PITTS ◽  
ANTHONY P. CULLEN ◽  
PIERRETTE D. HACKER
Keyword(s):  
Ultraviolet Radiation ◽  
Near Ultraviolet

Near-Ultraviolet Radiation Suppresses Pineal Melatonin Content*

Endocrinology ◽  
1986 ◽  
Vol 119 (5) ◽  
pp. 2201-2205 ◽  
Author(s):  
GEORGE C. BRAINARD ◽  
PATRICIA L. PODOLIN ◽  
SANDER W. LEIVY ◽  
MARK D. ROLLAG ◽  
CURTIS COLE ◽  
...  
Keyword(s):  
Ultraviolet Radiation ◽  
Pineal Melatonin ◽  
Near Ultraviolet

scholarly journals Effect of Near-ultraviolet Radiation on the Responsibility of Antioxidative Function of Orchid Leaves

2005 ◽  
Vol 17 (4) ◽  
pp. 192-198
Author(s):  
Xiheng ZHAO ◽  
Jincai LI ◽  
Shuichiro MATSUI ◽  
Shigenori MAEZAWA
Keyword(s):  
Ultraviolet Radiation ◽  
Antioxidative Function ◽  
Near Ultraviolet
Sign in / Sign up

Export Citation Format

Share Document