The Mirror Image Symmetry in the Optical Absorption/Luminescence Spectra of Silver Nanoparticles in Ag/Ag2O Composites Synthesized by Oxygen Plasma Treatment of Silver Thin Films

Abstract In this work, we present the results of a unique study that aims to detect the structural effects on the plasma edges in optical reflectance spectra of Ag/Ag2O composites synthesized by treating silver thin films manufactured by thermal evaporation method with oxygen plasma afterglow. The results showed that, each of the optical reflectance spectra contains two plasma edges, the first (λI) belongs to the surface plasmons of the individual silver nanoparticles, and the second (λL) belongs to the larger silver nanoparticles. In addition, we found that the positions of the plasma edges are linearly related to the positions of the optical absorption peaks, except for high and low oxidation rates cases. On the other hand, taking into account previous work, we obtained indications that, the ratio NI/NL may be a measure of the film's effectiveness in inhibiting bacteria.

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Electrical and Physical Characteristics of Ba(Zr0.1Ti0.9)O3 Thin Films under Oxygen Plasma Treatment for Nonvolatile Memory Devices Application

High-Performance Ceramics V - Key Engineering Materials ◽

10.4028/0-87849-473-1.75 ◽

2008 ◽

pp. 75-77

Author(s):

Kai Huang Chen ◽

Ying Chung Chen ◽

Wei Kuo Chia ◽

Zhi Sheng Chen ◽

Cheng Fu Yang ◽

...

Keyword(s):

Thin Films ◽

Plasma Treatment ◽

Nonvolatile Memory ◽

Oxygen Plasma ◽

Physical Characteristics ◽

Oxygen Plasma Treatment ◽

Memory Devices ◽

Nonvolatile Memory Devices

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Preparation of Silver-Plated Para-Aramid Fiber by Employing Low-Temperature Oxygen Plasma Treatment and Dopamine Functionalization

Coatings ◽

10.3390/coatings9100599 ◽

2019 ◽

Vol 9 (10) ◽

pp. 599 ◽

Cited By ~ 1

Author(s):

Zhenhua Sun ◽

Yanfen Zhou ◽

Wenyue Li ◽

Shaojuan Chen ◽

Shihua You ◽

...

Keyword(s):

Electrical Conductivity ◽

Silver Nanoparticles ◽

Plasma Treatment ◽

Electrical Resistance ◽

Oxygen Plasma ◽

Attenuated Total Reflection ◽

Oxygen Plasma Treatment ◽

Washing Fastness ◽

Before And After ◽

Electroless Silver Plating

Direct electroless silver plating of para-aramid (PPTA) is difficult due to its extremely low surface chemical energy. In order to facilitate the deposition of silver nanoparticles and to enhance the washing fastness, oxygen plasma treatment and dopamine modification were conducted before silver plating of PPTA fibers. Various techniques including scanning electron microscopy (SEM), attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR), X-ray diffractometer (XRD) and thermogravimetric analyzer (TGA) were used to characterize the surface morphology, chemical composition and thermal stability of the silver-plated PPTA fibers. Electrical resistance and silver content of the silver-coated PPTA fibers before and after standard washing were also studied. The results showed that silver nanoparticles were successfully coated onto the surface of PPTA fibers with and without plasma treatment, but the coating continuity and the electrical conductivity of the silver-coated PPTA fibers were greatly enhanced with the assistance of plasma treatment. It was also demonstrated that the washing fastness of silver-coated PPTA fibers was improved after plasma treatment as indicated by electrical resistance and continuity of the silver nanoparticles after various washing cycles. It was found that the electrical resistance of plasma-treated PPTA-PDA/Ag fibers prepared at an AgNO3 concentration of 20 g/L reached 0.89 Ω/cm and increased slightly to 0.94 Ω/cm after 10 standard washing cycles. The silver-coated PPTA fibers also showed stable electrical conductivity under 250 repeated stretching-releasing cycles at a strain of 3%.

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