20 research outputs found
Plasmonic Photosensitization of Polyaniline Prepared by a Novel Process for High-Performance Flexible Photodetector
We report the synthesis of a polyaniline
(PAni)–gold nanoparticle
(AuNP) composite thin film in a single step. A flexible high-performance
visible photodetector is constructed using PAni–AuNP composite
with low loading of AuNP, and optoelectronic properties of the device
are evaluated. The present study demonstrates that a plasmonic hybrid
nanocomposite prepared by a single-step novel plasma-based dry process
could solve the low lifetime and performance-related issues of organic
optoelectronic devices
Plasmonic visible-NIR photodetector based on hot electrons extracted from nanostructured titanium nitride
Self-Powered Broadband Photodetector using Plasmonic Titanium Nitride
We
report the demonstration of plasmonic titanium nitride (TiN) for fabrication
of an efficient hybrid photodetector. A novel synthesis method based
on plasma nanotechnology is utilized for producing air stable plasma
polymerized aniline-TiN (PPA-TiN) nanocomposite and its integration
in photodetector geometry. The device performs as a self-powered detector
that responds to ultraviolet and visible light at zero bias. The photodetector
has the advantage of broadband absorption and outcomes an enhanced
photoresponse including high responsivity and detectivity under low
light conditions. This work opens up a new direction for plasmonic
TiN-based hybrid nanocomposite and its exploitation in optoelectronic
applications including imaging, light-wave communication and wire-free
route for artificial vision
Methanol steam reforming behavior of sol-gel synthesized nanodimensional CuxFe1-xAl2O4 hercynites
This work reports the outstanding catalytic activity behavior of sol-gel synthesized nanostructured CuxFe1-xAl2O4 (0.3¿=¿x¿=¿0.8; named as CuFeAln, where n¿=¿30, 40, 50, 60, 70 and 80) hercynites towards methanol steam reforming (MSR) for hydrogen generation. Based on the durability studies, we had categorized the higher Cu-doped hercynites (CuFeAl70 and CuFeAl80) as the more effective in regard to activity and stability (maintenance of a methanol conversion of ~80% with low CO selectivity of 2% after 50¿h of continuous operation at 275¿°C for CuFeAl80) when compared with the lower Cu-doped counterparts (CuFeAl30 and CuFeAl40). The specific surface area of all the materials was about 50 m2¿g-1 and they had similar reduction characteristics as obtained from H2-TPR analysis. The lower reducibility below 280¿°C of CuFeAl70 and CuFeAl80 was correlated with the higher stability of these samples during time on stream operation. The powder XRD analyses had shown pure phase hercynite formation with the gradual increase of Cu-doping, while there occurred a phase segregation in the reforming atmosphere leading to the formation of metallic copper. High resolution microstructural analyses had confirmed single phase hercynite formation at nanoscale and a reduction of copper subsequent to ageing as well as certain growth of the copper metal particles (from ~5¿nm to ~8¿nm) corroborating the XRD studies. The surface features from in-situ XPS had also suggested formation of reduced copper species, which was much lower for the higher Cu-doped samples. Cu K edge XANES spectral analyses also pointed to lower occurrence of reduced copper in the aged samples of higher Cu-doped hercynites. The experimental findings had been explained on the basis of partial breakdown of the spinel lattice structure leading to the formation of CuO, followed by its reduction to metallic copper nanocrystallites in the MSR atmosphere. A definite ratio of the reduced to oxidized copper species was maintained with time on stream and this caused nearly stable conversion behavior of the catalysts in methanol steam reforming.Peer ReviewedPostprint (author's final draft
Role of hydrogen diffusion in temperature-induced transformation of carbon nanostructures deposited on metallic substrates by using a specially designed fused hollow cathode cold atmospheric pressure plasma source
Methanol steam reforming behavior of sol-gel synthesized nanodimensional CuxFe1-xAl2O4 hercynites
This work reports the outstanding catalytic activity behavior of sol-gel synthesized nanostructured CuxFe1-xAl2O4 (0.3¿=¿x¿=¿0.8; named as CuFeAln, where n¿=¿30, 40, 50, 60, 70 and 80) hercynites towards methanol steam reforming (MSR) for hydrogen generation. Based on the durability studies, we had categorized the higher Cu-doped hercynites (CuFeAl70 and CuFeAl80) as the more effective in regard to activity and stability (maintenance of a methanol conversion of ~80% with low CO selectivity of 2% after 50¿h of continuous operation at 275¿°C for CuFeAl80) when compared with the lower Cu-doped counterparts (CuFeAl30 and CuFeAl40). The specific surface area of all the materials was about 50 m2¿g-1 and they had similar reduction characteristics as obtained from H2-TPR analysis. The lower reducibility below 280¿°C of CuFeAl70 and CuFeAl80 was correlated with the higher stability of these samples during time on stream operation. The powder XRD analyses had shown pure phase hercynite formation with the gradual increase of Cu-doping, while there occurred a phase segregation in the reforming atmosphere leading to the formation of metallic copper. High resolution microstructural analyses had confirmed single phase hercynite formation at nanoscale and a reduction of copper subsequent to ageing as well as certain growth of the copper metal particles (from ~5¿nm to ~8¿nm) corroborating the XRD studies. The surface features from in-situ XPS had also suggested formation of reduced copper species, which was much lower for the higher Cu-doped samples. Cu K edge XANES spectral analyses also pointed to lower occurrence of reduced copper in the aged samples of higher Cu-doped hercynites. The experimental findings had been explained on the basis of partial breakdown of the spinel lattice structure leading to the formation of CuO, followed by its reduction to metallic copper nanocrystallites in the MSR atmosphere. A definite ratio of the reduced to oxidized copper species was maintained with time on stream and this caused nearly stable conversion behavior of the catalysts in methanol steam reforming.Peer Reviewe