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Two recently developed nanotechnology courses are described in the context of university general education requirements. The senior/graduate laboratory course is primarily focused on the preparation and properties of ultra-thin vacuum-deposited discontinuous gold films on glass, (i.e. the structure-dependent electrical and optical properties,) but also includes experiments in nano-silver sintering...
In this paper, a simple and inexpensive method of preparing carbon-based nanomaterials via Co-based catalyst has been demonstrated. It was shown by various optical and structural characterization that well-graphitized carbon nano-sphere can be prepared using the proposed process. Through the data extracted from Raman spectra, it was found that the as-deposited samples showed much lower Id/Ig than...
We report the tunable conductivity of single walled carbon nanotubes and multi-walled carbon nanotubes with their surface walls decorated by Gold nanoparticles in the elusive THz frequency range (0.3–2.0 THz). Colloidal gold nanoparticles were synthesized by the reduction of gold chloride solution using tri-sodium citrate. A simple chemical route is followed to attach Au NP on the surfaces of carbon...
Spin-capable multi-walled carbon nanotube (MWCNT) forests that form webs, sheets, and yarns can play an important role in means for advancing various technologies. It is critical to understand the parameters that affect to grow spin-capable carbon nanotubes (CNTs) in a repeatable fashion. In this paper, we investigated the effects of carrier gases on the catalytic properties of iron (Fe) in the synthesis...
A novel density control of carbon nanotubes is fabricated using partial oxidation of catalyst metal prior to the CNTs growth. The results show that CNTs are aligned, closely spaced, and divided into two groups with some long nanotubes protruding among short ones. Field emission improvement is achieved due to those long nanotubes are subjected less field screening effect from the surrounding nanotubes...
This paper reports a new class of biosensors based on composite nanomaterial thin film. The composite nanomaterial film is synthesized using a simple vacuum filtration method. Using composite nanomaterial film, we can not only simplify the positioning and integration fabrication process of nanoscale materials into a functional device, but also enhance the sensing surface area significantly, which...
A highly sensitive and stable L-Lactate sensor based on the synergic action of multi-wall carbon nanotube (MWCNTs) and ZnO nanoparticles has been developed. The unique sandwich-like layer structure (PDDA/LOD/ZnO/MWCNTs) provides a favorable microenvironment to keep the bioactivity of LOD and prevent enzyme molecule leakage. Therefore, the proposed L-Lactate biosensor exhibited good analytical performances...
Novel non-fragile porous conductive nanocomposite vapor sensors with variant volume porosities and specific surface areas have been fabricated from PMMA and carbon nanoparticles. Sensing films were obtained by well known dry-cast non-solvent induced phase separation (NIPS) method. Porous composite structures have been characterized by SEM, BET and water evaporation methods. Response behavior of fabricated...
In this study, we are focusing on the detailed control of the size and density of nanoparticles on the substrate by employing the gas-phase catalyst. To fabricate iron (Fe) nanoparticles as catalyst, Fe(CO)5 gas was used. Size and density of the nanoparticles can be controlled by varying the experimental parameters, such as the molar flow rate, the decomposition temperature and the flow time. Quartz...
As we know, the unsatisfactory field emission from the films by electrophoresis is resulted from the weak adhesion. The main aim of this paper is to improve the adhesion surrounding electrophoresis technologies. In addition, A simple controllable method is reported for the coating of ZnO nanowires with Ag nanoparticles and ZnO/Carbon nanotubes (CNT) composite.
Interest in the growth of carbon nanotubes by chemical vapor deposition technique using transition 3d metals as catalyst support is still a subject of intense research. In this paper, we report the morphological and magnetic properties of Co films with varying thickness prior to and post de-wetting that enabled the formation of island-like structures. Interestingly enough, we found different magnetic...
We report on a novel method based on a plasma pre-treatment for controlled nanostructuration and patterning of iron catalyst particles from a continuous film in view of carbon nanotube growth. The effects of the hydrogen plasma conditions on the diameter and the density of the catalyst nanoparticles was studied and discussed. We were then able to propose a comprehensive mechanism for the metallic...
As we know, the unsatisfactory field emission from the films by electrophoresis is resulted from the weak adhesion. The main aim of this paper is to improve the adhesion surrounding electrophoresis technologies. The technique we applied is referred to employ both organic binders and inorganic solution simultaneously. In addition, the influences of the applied voltage, inter-electrode distance and...
Carbon nanotubes (CNTs) films were synthesized at low pressure using nickel as catalyst by thermal chemical vapor deposition with hydrogen-acetylene mixture. The Raman characteristics and morphological features of CNTs at different substrate temperatures were investigated. The variation of CNTs morphological feature mainly depends on the substrate temperatures. In the low temperature range (450-550degC),...
This paper discussed the surface resistance of carbon nanotube (CNT)/inorganic binder/silver composites film. The used CNT were multiwalled CNT with diameter of 20 nm-40 nm and 5-15 m in length. We used two inorganic binders: sodium metasilicate and tetraethyl orthosilicate (TEOS) and two silvers: nanosilver in powder and solutions. The CNT were separated and dispersed in inorganic binder with different...
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