Charging Effects on SEM/SIM Contrast of Metal/Insulator System in Various Metallic Coating Conditions
نویسندگان
چکیده
Scanning electron microscope (SEM) and scanning ion microscope (SIM) observations were performed to investigate the charging effect and the related contrast variation for images of conductive and non-conductive specimens under electron and Gaþ ion beam irradiations. The contrast variation in the specimens was investigated by changing the coating conditions. It was found that the contrast in conductive specimens was basically caused by differences in atomic number and that the charging effect in conductive specimens is generally smaller than that in nonconductive specimens. On the other hand, the SEM contrast of non-conductive specimens varied widely, depending on the coating conditions. These contrast variations were found to be caused by negative charges accumulated on the surface of the specimens. The SIM contrast of nonconductive specimens changed to dark when the coating condition was insufficient. The contrast variations were found to be caused by the accumulation of positive charges on the surface of specimens. [doi:10.2320/matertrans.M2010034]
منابع مشابه
Advantages of Helium and Neon Ion Beams for Intelligent Imaging
Scanning electron microscopy (SEM) has become a crucial tool to visualize the exterior morphology and surface structures for samples in both biology and material science. Conventional SEMs are usually limited by relative low resolution and charging effects. Carbon or metal coating is required for insulator samples to minimize charging effects. However, the coating layer can sometimes obscure mi...
متن کاملEffect of Wet and Dry Conditions on Wear Behavior of Amorphous Coating of Fe-Cr-Mo-Nb-C-B
Recently, wear resistant properties of metallic glasses has attracted a lot of interest. Because the surface of metallic glasses are prone to phase transformation, finding the effects of test condition on structure and wear behavior of metallic glasses is important. In this research, by using an automated electrospark deposition (ESD), a layer of Fe51Cr18Mo7B16C4Nb4 was deposited on AISI 316l s...
متن کاملRoom Temperature Cured Hydrophobic Nano-silica Coatings for Outdoor Insulators Installed on Power Lines without Shutting Down the Current
The goal of the present study is to prepare a room temperature cured hydrophobic and self-cleaning nano-coating for power line insulators. As a result, the installed insulators operating in power lines can be coated without being removed from the circuit and without the need to cut off power. For this purpose, hydrophobic silica nanoparticles were synthesized by sol-gel method using TEOS and HM...
متن کاملPreparation of SiO2/ZrO2 ceramic nanocomposite coating on Aluminum alloys as metallic part of the photovoltaic cells and study its corrosion behavior.
Nowadays due to water shortage, the use of air humidity as the sustainable solution has been considered by cities located in coastal zones; especially in warm and humid climate. However, the use of air humidity also has its own problems such as corrosion of metal parts in photovoltaic cells that used for energy supplying and they are often made of Aluminum alloy. Therefore different methods suc...
متن کاملCryo-scanning electron microscopy of plant samples without metal coating, utilizing bulk conductivity
A classical problem in scanning electron microscopy is the alteration of specimen surfaces due to sample preparation. Simplified techniques for sample preparation with minimized surface alteration are therefore desirable. For fresh (hydrated) biological material, cryo-SEM after preceding shock-freezing and metal-coating is favoured when the prevention of drying artifacts has priority. A detaile...
متن کامل