Tailoring nanomaterial products through electrode material and oxygen partial pressure in a mini-arc plasma reactor
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Nanomaterials with controllable morphology and composition are synthesized by a simple one-step vapor condensation process using a mini-arc plasma source. Through systematic investigation of mini-arc reactor parameters, the roles of carrier gas, electrode material, and precursor on producing diverse nanomaterial products are revealed. Desired nanomaterial products, including tungsten oxide nanoparticles (NPs), tungsten oxide nanorods (NRs), tungsten oxide and tin oxide NP mixtures and pure tin dioxide NPs can thus be obtained by tailoring reaction conditions. The amount of oxygen in the reactor is critical to determining the final nanomaterial product. Without any precursor material present, a lower level of oxygen in the reactor favors the production of W18O49 NRs with tungsten as cathode, while a high level of oxygen produces more round WO3 NPs. With the presence of a precursor material, amorphous particles are favored with a high ratio of argon:oxygen. Oxygen is also found to affect tin oxide crystallization from its amorphous phase in the thermal annealing. Results from this study can be used for guiding gas phase nanomaterial synthesis in the future.
KeywordsNanoparticle Nanorod Mini-arc plasma Oxygen partial pressure Gas phase
The authors would like to thank the financial support from the National Science Foundation (CMMI-0856753 and CMMI-0900509). The EDX was conducted at the Electron Microscope Laboratory of University of Wisconsin-Milwaukee (UWM). TEM analyses were conducted in the UWM HRTEM Laboratory. The authors thank Mr. Donald Roberson for technical support with TEM analyses and anonymous reviewers for their thoughtful comments.
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