Additional file 1: Table S1. of Self-Consistent Charge Density Functional Tight-Binding Study of Poly(3,4-ethylenedioxythiophene): Poly(styrenesulfonate) Ammonia Gas Sensor

Average bond lengths, bond angle and torsion angle of EDOT, SS, EDOT of EDOT:SS (EDOT:SS*1) and SS of EDOT:SS (EDOT:SS*2) with n = 1 units optimized by B3LYP/6-31G* and SCC-DFTB calculation. Table S2. Average bond lengths, bond angle and torsion angle of EDOT, SS, EDOT of EDOT:SS (EDOT:SS*1) and SS of EDOT:SS (EDOT:SS*2) with n = 2 units optimized by B3LYP/6-31G* and SCC-DFTB calculation. Table S3. Average bond lengths, bond angle and torsion angle of EDOT, SS, EDOT of EDOT:SS (EDOT:SS*1) and SS of EDOT:SS (EDOT:SS*2) with n = 3 units optimized by B3LYP/6-31G* and SCC-DFTB calculation. Table S4. Average bond lengths, bond angle and torsion angle of EDOT, SS, EDOT of EDOT:SS (EDOT:SS*1) and SS of EDOT:SS (EDOT:SS*2) with n = 10 units optimized by SCC-DFTB calculation. Table S5. Energy of the HOMO and LUMO in eV of EDOT, SS and EDOT:SS oligomers optimized by SCC-DFTB calculation. (DOCX 29 kb

Conversion of Carbon Dioxide into Chemical Vapor Deposited Graphene with Controllable Number of Layers via Hydrogen Plasma Pre-Treatment

In this work, we report the conversion of carbon dioxide (CO2) gas into graphene on copper foil by using a thermal chemical vapor deposition (CVD) method assisted by hydrogen (H2) plasma pre-treatment. The synthesized graphene has been characterized by Raman spectroscopy, X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The results show the controllable number of layers (two to six layers) of high-quality graphene by adjusting H2 plasma pre-treatment powers (100–400 W). The number of layers is reduced with increasing H2 plasma pre-treatment powers due to the direct modification of metal catalyst surfaces. Bilayer graphene can be well grown with H2 plasma pre-treatment powers of 400 W while few-layer graphene has been successfully formed under H2 plasma pre-treatment powers ranging from 100 to 300 W. The formation mechanism is highlighted