Synthesis of Carbon Nanowalls and Few-Layer Graphene Sheets on Transparent Conductive Substrates

Abstract

Abstract:We report on the growth of carbon nanowalls and few-layer graphene sheets on glass substrates coated with different transparent conductive oxides or gold. The growth is accomplished by a capacitively-coupled radio-frequency plasma-enhanced chemical vapor deposition setup with a gas mixture of C 2 H 2 , H 2 , and Ar or He. This system allows the synthesis of thin vertical carbon nanosheets without catalyst at mild reaction conditions due to the low plasma density, which is preferable for sensitive substrate materials. In fact, the electrical properties of the transparent conductive indium tin oxide and fluorinedoped tin oxide stay intact upon carbon growth. Carbon nanowalls and few-layer graphene sheets on transparent conductive oxides are promising candidates for solar-cell applications while these nanostructures on gold coated glass can act as catalyst support material.

Fabrication of SnS nanowalls via pulsed plasma-enhanced chemical vapor deposition using a metal–organic single-source precursor

“…The final goal was to establish a geometry as it is typical for carbon nanowalls. 26 For carbonnanowall formation, it has been shown that grain boundaries play a crucial role, according to Zhu et al 48 During the first few minutes of the synthesis, the formation of a 1-15 nm thick layer of graphitic sheets is described, which grows parallel to the substrate. Once a sufficient level of force develops at the grain boundaries, vertical, diffusion-controlled growth is enabled.…”

“…A very prominent example for nanowalls are carbon nanowalls. 26,27 These structures are typically synthesized via plasma-enhanced chemical vapor deposition (PECVD). In the past, PECVD has already been used for the deposition of tin sulfide.…”

Highly Efficient Fuel Cell Electrodes from Few-Layer Graphene Sheets and Electrochemically Deposited Palladium Nanoparticles

“…The synthesis was performed in a custom-built capacitively coupled radio-frequency (13.56 MHz) plasmaenhanced CVD (CC-PECVD) setup. 15 A gas mixture of C 2 H 2 , H 2 , and He with flow rates of 10, 80, and 70 standard cubic centimeters per minute (sccm), respectively, were used. The substrate temperature of 650 °C was controlled by a resistively heatable stage that also acts as counter electrode.…”

“…Recently we have shown that these highly conductive carbon nanostructures can be prepared with a very high specific surface area. 15 Here, we used a high-voltage electrochemical deposition technique to prepare Pd nanoparticles directly on the FLG sheets to ensure that every catalyst particle has electrical contact. This method led to controllable catalyst loadings showing a homogenous arrangement of small particles, which is unprecedented in literature so far.…”

“…Hence in this work we used an alternative carbon support, namely, few-layer graphene (FLG) sheets, which are grown on gold-coated heat-resistant aluminosilicate glass by plasma-enhanced chemical vapor deposition (PECVD). Recently we have shown that these highly conductive carbon nanostructures can be prepared with a very high specific surface area . Here, we used a high-voltage electrochemical deposition technique to prepare Pd nanoparticles directly on the FLG sheets to ensure that every catalyst particle has electrical contact.…”