Silver Film Atomic Oxygen Sensors: Further Evidence for Utility as an Atmospheric Probe

1974 ◽  
Vol 52 (21) ◽  
pp. 2174-2175 ◽  
Author(s):  
W. R. Henderson
Keyword(s):  
Atomic Oxygen ◽  
Silver Film ◽  
Oxygen Sensors ◽  
Rate Of Change ◽  
Upper Atmosphere ◽  
Silver Films

Further evidence for the utility of thin silver films as detectors of atomic oxygen in the upper atmosphere is given. Measurements show that under prescribed conditions no correction for rate of oxidation or rate of change of oxidation is necessary.

Silver Film Atomic Oxygen Sensors

1972 ◽  
Vol 50 (14) ◽  
pp. 1676-1681 ◽  
Author(s):  
Ronald J. Thomas ◽  
Doran J. Baker
Keyword(s):  
Thin Film ◽  
Atomic Oxygen ◽  
Silver Film ◽  
Surface Recombination ◽  
Oxide Thickness ◽  
Oxygen Sensors ◽  
Recombination Coefficient ◽  
Thin Film Sample ◽  
Film Sample ◽  
Initial Oxidation

Measurements indicate that the initial oxidation rate of a thin film of silver is linearly proportional to the atomic oxygen flux; however, the oxidation coefficient is dependent upon the technique for depositing and chemically reducing the thin film. A model is developed relating the conductance of a thin-film sample to its oxidation. The measurements and the model indicate that the silver film is very promising as a sensor of upper atmospheric atomic oxygen. The model also indicates that the surface recombination coefficient of atomic oxygen depends on the oxide thickness as well as the flux.

Effects of Nano Silver Film on the Hydrophobicity of Moth Wing

2015 ◽  
Vol 1095 ◽  
pp. 608-611
Author(s):  
Yan Fang ◽  
Gang Sun
Keyword(s):  
Silver Film ◽  
Tertiary Structure ◽  
Wing Surface ◽  
Optical Contact ◽  
Silver Films ◽  
Biological Coupling ◽  
Infrared Spectrometer ◽  
Ft Ir ◽  
Micro Morphology ◽  
Hydrophobic Material

The microstructure, superhydrophobicity and chemical composition of the moth wing surface were investigated by a scanning electron microscope (SEM), an optical contact angle (CA) meter and a Fourier transform infrared spectrometer (FT-IR). nanosilver film was coated on the wing surface by vacuum evaporation. The wetting mechanism was discussed from the perspective of biological coupling. The moth wing surface, composed of naturally hydrophobic material, is of high hydrophobicity (CA 143~156°) and exhibits complicated hierarchical micro-morphology including primary structure, secondary structure and tertiary structure. The cooperation of hydrophobic material and rough micro-morphology leads to the high hydrophobicity of the wing surface. The wing surfaces coated with 50~1000 nm silver films are still hydrophobic (CA > 110°). The multiple-dimensional rough structure of the wing surface results in the transition of metal silver from hydrophilic to hydrophobic. The moth wing can serve as a bio-template for design and preparation of micro-controllable superhydrophobic surface.

scholarly journals Mariner 6: Ultraviolet spectrum of Mars upper atmosphere

1971 ◽  
Vol 40 ◽  
pp. 253-256 ◽  
Author(s):  
C. A. Barth ◽  
W. G. Fastie ◽  
C. W. Hord ◽  
J. B. Pearce ◽  
K. K. Kelly ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Carbon Monoxide ◽  
Spectral Region ◽  
Atomic Hydrogen ◽  
Atomic Oxygen ◽  
Ultraviolet Spectrum ◽  
Upper Atmosphere

Emission features from ionized carbon dioxide and carbon monoxide were measured in the 1900- to 4300-Å spectral region. The Lyman-α 1216-Å line of atomic hydrogen and the 1304-, 1356-, and 2972-Å lines of atomic oxygen were observed.

Morphologies of Silver Films Fabricated by Thermal Decomposition of Silver Behenate

2006 ◽  
Vol 11-12 ◽  
pp. 481-484
Author(s):  
Xian Hao Liu ◽  
Shu Xia Lu ◽  
Wei Liang Cao ◽  
Jing Chang Zhang
Keyword(s):  
Thermal Decomposition ◽  
Thick Film ◽  
Silver Film ◽  
The Other ◽  
Silver Particles ◽  
High Concentration ◽  
Decomposition Products ◽  
Silver Films ◽  
Triangular Shape ◽  
Thermal Decomposition Products

Various morphologies of silver films fabricated by the thermal decomposition of silver behenate have been studied. The morphological structures of silver behenate films at different heating temperatures are characterized by using SEM, IR and XRD. It is found that, while heating the silver behenate films, the formed silver particles are stabilized by the other thermal decomposition products in the range of 193°C∼320°C. The influence of silver behenate concentration in organic solvent on the formation and packing density of as-fabricated silver films by thermal treatment on the silver behenate films at 500°C has been studied. The results show that the silver film fabricated by a millimolar solution of silver behenate possesses a silver monolayer; the silver thick film can be formed at high concentration, and interestingly, silver particles with regular triangular or truncated triangular shape in the silver thick film are also obtained.

scholarly journals A Fully Inkjet-Printed Strain Sensor Based on Carbon Nanotubes

Coatings ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 792 ◽  
Author(s):  
Hsuan-Ling Kao ◽  
Cheng-Lin Cho ◽  
Li-Chun Chang ◽  
Chun-Bing Chen ◽  
Wen-Hung Chung ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Surface Morphology ◽  
Silver Film ◽  
Strain Sensor ◽  
Strain Sensors ◽  
Gauge Factor ◽  
Lower Sensitivity ◽  
High Reproducibility ◽  
Silver Films ◽  
Microcrack Detection

A fully inkjet-printed strain sensor based on carbon nanotubes (CNTs) was fabricated in this study for microstrain and microcrack detection. Carbon nanotubes and silver films were used as the sensing layer and conductive layer, respectively. Inkjet-printed CNTs easily undergo agglomeration due to van der Waals forces between CNTs, resulting in uneven films. The uniformity of CNT film affects the electrical and mechanical properties. Multi-pass printing and pattern rotation provided precise quantities of sensing materials, enabling the realization of uniform CNT films and stable resistance. Three strain sensors printed eight-layer CNT film by unidirectional printing, rotated by 180° and 90° were compared. The low density on one side of eight-layer CNT film by unidirectional printing results in more disconnection and poor connectivity with the silver film, thereby, significantly increasing the resistance. For 180° rotation eight-layer strain sensors, lower sensitivity and smaller measured range were found because strain was applied to the uneven CNT film resulting in non-uniform strain distribution. Lower resistance and better strain sensitivity was obtained for eight-layer strain sensor with 90° rotation because of uniform film. Given the uniform surface morphology and saturated sheet resistance of the 20-layer CNT film, the strain performance of the 20-layer CNT strain sensor was also examined. Excluding the permanent destruction of the first strain, 0.76% and 1.05% responses were obtained for the 8- and 20-layer strain sensors under strain between 0% and 3128 µε, respectively, which demonstrates the high reproducibility and recoverability of the sensor. The gauge factor (GF) of 20-layer strain sensor was found to be 2.77 under strain from 71 to 3128 µε, which is higher than eight-layer strain sensor (GF = 1.93) due to the uniform surface morphology and stable resistance. The strain sensors exhibited a highly linear and reversible behavior under strain of 71 to 3128 µε, so that the microstrain level could be clearly distinguished. The technology of the fully inkjet-printed CNT-based microstrain sensor provides high reproducibility, stability, and rapid hardness detection.

FORMATION MECHANISM AND SURFACE EVOLUTION OF SILVER FILMS SPUTTERING DEPOSITED ON SILICONE OIL SUBSTRATES

2008 ◽  
Vol 15 (05) ◽  
pp. 525-530 ◽  
Author(s):  
SEN-JIANG YU ◽  
YONG-JU ZHANG
Keyword(s):  
Surface Morphology ◽  
Formation Mechanism ◽  
Silver Film ◽  
Silicone Oil ◽  
Dc Magnetron Sputtering ◽  
Continuous Film ◽  
Silver Films ◽  
Surface Evolution ◽  
Physical Mechanisms ◽  
Silver Atoms

The formation mechanism and surface evolution of thin silver films deposited on silicone oil substrates by a DC-magnetron sputtering method are reported. As the film thickness increases, the deposited silver atoms first form compact clusters, then transfer to ramified aggregates and finally form a continuous film on the liquid substrate. After deposition, the surface morphology of the silver film is susceptible to evolve successively in the atmosphere condition, resulting in the formation of broad cracks and straight-sided (or worm-like) wrinkles. The evolution behaviors and underlying physical mechanisms of the cracks and wrinkles are presented and discussed in detail.

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