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The time evolution of the Fermi level of the graphene channel during a gas sensing process is systematically investigated. A Fermi level converging behavior at negative back-gate voltage and a Fermi level pinning behavior at positive back-gate voltage are observed during NH3 gas sensing process for an originally p-type doped graphene channel. The experimental results confirm that the original p-type...
We present a simple processing method for synthesizing well-aligned millimeter-sized tetragon-shaped graphene domains on a polycrystalline copper substrate via low-pressure chemical vapor deposition. The tetragonal shape is achieved simply by wet loading the copper substrate with processing conditions previously used for the growth of millimeter-sized hexagon-shaped graphene domains. Electron backscatter...
Carbon dots (CD) are luminescent nanomaterial with unique properties that show great potential in many applications. Herein, branched polyethyleneimine-based carbon dots (PCD) are prepared from branched polyethyleneimine by oxidation and a modified hydrothermal reaction. Structure and composition analysis indicate that obtained PCD possesses a 3–4nm in diameter and a graphitic structure with lattice...
Substrates with and without catalyst layers have been tested for the capacitively coupled radio-frequency plasma-enhanced chemical-vapor deposition of carbon nanosheets (CNSs) at a temperature as low as 500°C. Glass coated with Ni, Ni/Co, Co/Ni, and Ni/Zn and glass without a catalyst layer were used as the substrates. CNSs were only obtained on substrate samples with a catalyst layer. The morphology...
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