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In this paper large area tungsten trioxide (WO3) nanosheets and nanoribbons are synthesized by directly heating tungsten plates covered with potassium iodide (KI). The field emission properties of the as-grown samples are systematically measured. A 10 μA/cm current density is obtained from both samples under a 5.5 V/μm average field, while the average fields that extracted a current density of 1.0...
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