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We present prominent photoresponse of bio-inspired graphene-based phototransistors sensitized with chlorophyll molecules. The hybrid graphene-chlorophyll phototransistors exhibit a high gain of 10 6 electrons per photon and a high responsivity of 10 6 A/W, which can be attributed to the integration of high-mobility graphene and the photosensitive chlorophyll molecules. The charge transfer...
An on-chip growth technique aiming at large-scale production of few-layer epitaxial graphene nanowall (EGNW) arrays by microwave plasma enhanced chemical vapor deposition has been demonstrated. This hetero-architecture is formed by growing edge-oriented SiC nanowalls on Si substrates, followed by surface graphitization, consequently, thus resulting in a heterojunction composed of a 2H-SiC nanowall...
We present the electronic structure evolution from graphite oxide to thermally reduced graphite oxide. Most functional groups were removed by thermal reduction as indicated by high resolution X-ray photoelectron spectroscopy, and the electrical conductivity increased 6 orders compare with the precursor graphite oxide. X-ray absorption spectroscopy reveals that the thermally reduced graphite oxide...
Adsorption of single-ringed N- and S-heterocyclic aromatics on single-walled carbon nanotubes (SWCNTs) was examined to explore the potential of using carbon nanotubes (CNTs) as drug carriers and environmental adsorbents. Adsorbates included pyrimidine, 2-aminopyrimidine, 4,6-diaminopyrimidine, thiophene, benzene and aniline. Adsorbents included pristine SWCNTs, oxidized SWCNTs, and nonporous graphite...
We have performed first-principles calculations to investigate the origin of adsorption of platinum on nitrogen- and boron-doped carbon nanotubes (CNTs). Our calculation results reveal that both nitrogen- and boron-doped CNTs can assist the reactivity of platinum adsorption on the CNT surface, although the detailed mechanisms are very different. For nitrogen-doped CNTs, the enhanced adsorption results...
Carbon nanofibers were synthesized on activated carbons produced from agricultural waste using chemical vapor deposition. Importantly, iron already present in the ash content of the activated carbon was employed as a natural catalyst for nanofiber formation. The need for a wet chemical catalyst preparation step was avoided.
Synthesis of carbon nanotubes (CNTs) by catalyst-free chemical vapor deposition (CFCVD) is one of the most important challenges in nanotube science. Self-assembling multi-walled CNTs (MWCNTs) were produced on a porous carbon surface using carbon black (CB) as a substrate, at 800°C by the decomposition of diluted ethylene. MWCNTs with an outer-diameter distribution of 20–80nm, examined by scanning...
The optical properties of small radius (<1nm) single wall carbon nanotubes (SWCNTs) alloyed with boron were examined using relaxed C–C bond length ab initio calculations in the long wavelength limit. The magnitude of the static dielectric constant essentially depends on the B concentration as well as the direction of polarization. The maximum value of the absorption coefficient is shown to strongly...
Using a mild wet-chemical route, cage-like phosphotungstic acid (HPW) molecules of 1.2nm diameter were successfully filled into opened carbon nanotubes (CNTs) with cavity diameter of 2nm. High resolution transmission electron microscope revealed that HPW molecules arrayed in a chain in the tube cavity, forming a new kind of peapod structure. In aqueous solution these unusual peapods showed higher...
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