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Coating Al2O3 on a 150um Pt sphere

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In my research I need to coat a Pt sphere with ~150um diameter with a layer of Al2O3. The thickness of the coating is not critical, as long as it can cover the Pt sphere. However, previous experience shows the thickness cannot be more than 2um, otherwise it is easy to be broken. Sputtering can do this kind of coating. The problem is how to hold this tiny sphere. Some people use tape to hold this sphere. After one side is coated, manually turn the sphere to other side and coat it. It is greatly appreciated if any other ideas are given on this problem.

Xueyang Yu
University of Western Ontario - London, Ontario, Canada

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Maybe figue a way to roll it instead of keeping it from rolling.

Ted Mooney, P.E. finishing.com Brick, New Jersey