Dip-pen technology

Deposition of small clusters using a STM tip can be used [183]. It could also position metal clusters at desired locations on a flat substrate. The technique can be scaled up using the millipede approach to deposit a large number of clusters simultaneously [184]. Potentially, it can be coupled with dip-pen technology for a continuous supply of the metal precursor [185]. At present, however, these techniques have not yet achieved atomic control. In other words, there is no technique yet to generate supported metal clusters of uniform composition, shape, and size. 

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