Comparison and analysis of Pd‐ and Pt‐GaAs Schottky diodes for hydrogen detection

1994 ◽  
Vol 75 (12) ◽  
pp. 8175-8181 ◽  
Author(s):  
W. P. Kang ◽  
Y. Gürbüz
Keyword(s):  
Schottky Diodes ◽  
Hydrogen Detection ◽  
Comparison And Analysis

Improved hydrogen detection sensitivity in N-polar GaN Schottky diodes

2009 ◽  
Vol 94 (21) ◽  
pp. 212108 ◽  
Author(s):  
Yu-Lin Wang ◽  
F. Ren ◽  
U. Zhang ◽  
Q. Sun ◽  
C. D. Yerino ◽  
...  
Keyword(s):  
Schottky Diodes ◽  
Detection Sensitivity ◽  
Hydrogen Detection

Palladium/cadmium‐sulfide Schottky diodes for hydrogen detection

1976 ◽  
Vol 28 (11) ◽  
pp. 687-688 ◽  
Author(s):  
Martin C. Steele ◽  
Bernard A. MacIver
Keyword(s):  
Cadmium Sulfide ◽  
Schottky Diodes ◽  
Hydrogen Detection

Erratum: “Improved hydrogen detection sensitivity in N-polar GaN Schottky diodes” [Appl. Phys. Lett. 94, 212108 (2009)]

2009 ◽  
Vol 95 (1) ◽  
pp. 019903 ◽  
Author(s):  
Yu-Lin Wang ◽  
F. Ren ◽  
Yu Zhang ◽  
Q. Sun ◽  
C. D. Yerino ◽  
...  
Keyword(s):  
Schottky Diodes ◽  
Detection Sensitivity ◽  
Hydrogen Detection

Hydrogen Detection with Noble Metal-TiO2 Schottky Diodes

2011 ◽  
Vol 495 ◽  
pp. 289-293 ◽  
Author(s):  
Saeedeh Rahbarpour ◽  
Faramarz Hossein-Babaei
Keyword(s):  
Work Function ◽  
Barrier Height ◽  
Noble Metal ◽  
Schottky Diodes ◽  
Gold Surface ◽  
Silver Surface ◽  
Current Increase ◽  
Hydrogen Detection ◽  
Fast Detection ◽  
Metal Interactions

Fast detection of hydrogen at a wide concentration range is desired for many applications. We report detecting hydrogen using Au-TiO2-Ti and Ag-TiO2-Ti diodes. While hydrogen-Au and hydrogen-Ag interactions are very different, at a constant biasing voltage, the measured current in both diodes is highly sensitive to the partial pressure of hydrogen contamination in the surrounding atmosphere. Work function variations were investigated by connecting the I-V specifications to the energy barrier height established at the Au-TiO2 and Ag-TiO2 junctions. Electronic features of the devices were described based on the assumption of two different hydrogen-noble metal interactions: Hydrogen reduces Ag work function by reducing the adsorbed oxygen species from the silver surface, while Au work function is reduced by the same mechanism as well as the direct adsorption of hydrogen species to the gold surface. Both of these mechanisms result in hydrogen detection by Schottky barrier height reduction and current increase.

Schottky diodes based on 2D materials for environmental gas monitoring: a review on emerging trends, recent developments and future perspectives

2021 ◽  
Author(s):  
Minu Mathew ◽  
Chandra Sekhar Rout
Keyword(s):  
Gas Sensing ◽  
2D Materials ◽  
Schottky Diodes ◽  
High Sensitivity ◽  
Future Perspectives ◽  
Working Temperature ◽  
Emerging Trends ◽  
Gas Sensing Properties ◽  
Recent Developments ◽  
Sensitivity And Selectivity

This review details the fundamentals, working principles and recent developments of Schottky junctions based on 2D materials to emphasize their improved gas sensing properties including low working temperature, high sensitivity, and selectivity.

The Effects of the sphragis on male and female genitalia in Acraea (Nymphalidae) butterflies

2020 ◽  
Vol 22 ◽  
Author(s):  
Shannon L Summers ◽  
Akito Y Kawahara ◽  
Ana P. S. Carvalho
Keyword(s):  
Interspecific Variation ◽  
Sperm Storage ◽  
Male Mating ◽  
Museum Collections ◽  
Storage Organ ◽  
Mating Plug ◽  
Males And Females ◽  
Comparison And Analysis ◽  
Imagej Software ◽  
Sexually Antagonistic Coevolution

Male mating plugs have been used in many species to prevent female re-mating and sperm competition. One of the most extreme examples of a mating plug is the sphragis, which is a large, complex and externalized plug found only in butterflies. This structure is found in many species in the genus Acraea (Nymphalidae) and provides an opportunity for investigation of the effects of the sphragis on the morphology of the genitalia, which is poorly understood. This study aims to understand morphological interspecific variation in the genitalia of Acraea butterflies. Using specimens from museum collections, abdomen dissections were conducted on 19 species of Acraea: 9 sphragis bearing and 10 non-sphragis bearing species. Genitalia imaging was performed for easier comparison and analysis and measurements of genitalia structures was done using ImageJ software. Some distinguishing morphological features in the females were found. The most obvious difference is the larger and more externalized copulatory opening in sphragis bearing species, with varying degrees of external projections. Females of the sphragis bearing species also tend to have a shorter ductus (the structure that connects the copulatory opening with the sperm storage organ) than those without the sphragis. These differences may be due to a sexually antagonistic coevolution between the males and females, where the females evolve larger and more difficult to plug copulatory openings and the males attempt to prevent re-mating with the sphragis.

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