Graphene-Nanodiamond Heterostructures and their application to High Current Devices

Abstract

Graphene on hydrogen terminated monolayer nanodiamond heterostructures provides a new way to improve carrier transport characteristics of the graphene, offering up to 60% improvement when compared with similar graphene on SiO2/Si substrates. These heterostructures offers excellent current-carrying abilities whilst offering the prospect of a fast, low cost and easy methodology for device applications. The use of ND monolayers is also a compatible technology for the support of large area graphene films. The nature of the C-H bonds between graphene and H-terminated NDs strongly influences the electronic character of the heterostructure, creating effective charge redistribution within the system. Field effect transistors (FETs) have been fabricated based on this novel herterostructure to demonstrate device characteristics and the potential of this approach.

Low temperature synthesis of NbC/C nano-composites as visible light photoactive catalyst

“…HR-XPS data for Nb3d suggest that direct conversion of Nb 2 O 5 to NbC involved reduction and carburization simultaneously which was responsible for the multiple transitions of oxidation states of Nb in the lattice as earlier discussed for XRD analyses. The HR-XPS spectrum of C 1 s as shown in Figs 2c and S2 revealed the presence of peaks associated with NbC, C-C sp 2 and C-C sp 3 bonds in all the samples at 282.8, 284.4 and 285.1 eV, respectively 59 – 63 . Further, peaks observed around 286.4, 288.1 and 290.1 eV might be associated to hydroxyl, carbonyl groups and π → π* transitions, respectively 62 , 63 .…”

“…2 1.08 284.40 56.10 284.40 54.10 284.40 59.39 284.40 51.60 59 , 62 C sp. 3 1.43 285.01 18.72 285.08 23.57 285.13 18.99 284.92 25.84 62 , 63 C-OH 1.87 286.01 12.99 286.46 4.50 286.32 7.72 286.40 7.80 COOH 3.32 288.22 5.49 288.02 10.22 288.17 5.51 288.29 4.83 π-π* 3.11 290.18 4.57 289.71 4.70 290.13 5.01 290.39 6.49 C content (%) 78.25 72.65 76.15 75.17 O 1s Nb 2 O 5 1.56 530.43 53.79 529.98 42.49 530.26 53.68 529.98 49.48 64 OH/CO 3 /O v 1.54 531.79 25.35 531.32 39.85 531.60 32.23 531.35 24.24 64 H 2 O/C=O 1.76 532.84 20.87 ...…”

Spirobifluorene‐based Porous Organic Polymers as Efficient Porous Supports for Pd and Pt for Selective Hydrogenation

“…XPS also provided information about the state of the carbon in the POPs. The deconvolution of the C1s spectra for POP2 and Pd/POP2 samples (Figure (b, e)) led to three components located at 284.6, 285.6 and 286.6 eV, respectively, that correspond to sp 2 and sp 3 C and C bonded to oxygen (C−O) species . Further deposition of Pd on POP2, led to a more complex C spectrum evidencing the presence of C=O and COOH groups (287.6, 288.7 eV) that well correlated to the concentration of the Pd 2+ species.…”

N‐Doped Carbon Wrapped Polyoxometalate Derived from POM‐IL Hybrid: A Heterogeneous Catalyst for the Synthesis of Coumarin Derivatives under Solvent‐Free Conditions

“…The binding energy at 284.65 eV is attributed to C–C/C=C and 285.34 eV is assigned to sp 2 C–N bonding in heteroaromatic moiety . The higher binding energy peak at 286.43 eV and 288.38 eV corresponded to the carbon bonded to hydroxyl groups and carboxylic acid groups respectively . Upon deconvolution of N1s high resolution spectra, four peaks were observed at 397.08, 399.08, 401.08 and 403.08 eV (Figure c) and they are attributed to pyridinic N, pyrrolic N, graphitic N and pyridinic N‐oxide respectively .…”