Yes, carbon can be sputtered onto a specimen.
However, the resulting films often have high hydrogen proportions.
This makes carbon sputtering undesirable for SEM operations.
The high hydrogen content can interfere with the clarity and accuracy of the imaging in electron microscopy.
5 Key Points to Consider
1. What is Carbon Sputtering?
Carbon sputtering involves the process where energetic ions or neutral atoms impact the surface of a carbon target.
This causes some of the carbon atoms to be ejected due to the energy transferred.
These ejected atoms are then deposited onto the specimen, forming a thin film.
2. The Role of Voltage in Sputtering
The process is driven by an applied voltage.
This voltage accelerates electrons towards a positive anode.
It also attracts positively charged ions towards the negatively biased carbon target.
This initiates the sputtering process.
3. Hydrogen Content Issues
Despite its feasibility, the use of carbon sputtering for SEM applications is limited.
This is due to the high hydrogen concentrations in the sputtered films.
Hydrogen can interact with the electron beam in ways that distort the image or interfere with the analysis of the specimen.
4. Alternative Methods
An alternative method for achieving high-quality carbon coatings for SEM and TEM applications is through thermal evaporation of carbon in a vacuum.
This method avoids the issues associated with high hydrogen content.
It can be performed using either carbon fiber or a carbon rod, the latter being a technique known as the Brandley method.
5. Practical Application in SEM
In summary, while carbon can technically be sputtered onto a specimen, its practical application in SEM is limited due to the high hydrogen content in the sputtered films.
Other methods such as thermal evaporation are preferred for obtaining high-quality carbon coatings in electron microscopy.
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