Abstract
An improved layer-by-layer vacuum filtration method was adopted for the fabrication of single-walled carbon nanotube (SWCNT) films aiming at a series of SWCNT films with controllable thickness and density. The electrical transport properties of the multilayered SWCNT films have been investigated. With the constant film density, the decrease of the layer number of the SWCNT film results in an increase of the temperature coefficient of resistance (TCR). SWCNT film with 95% metallic nanotubes has shown a lower TCR than that of the SWCNT films with a low percentage of metallic nanotubes. The effect of thermal annealing and subsequent acid (HNO3) treatment on the electrical properties of the SWCNT films has also been investigated.
Highlights
Even though single-tube devices based on single-walled carbon nanotubes (SWCNTs) have excellent properties [1,2,3], these devices are usually fabricated randomly since it is very difficult to find two identical SWCNTs through currently available technology
Aiming to produce an optimal SWCNT film with a high temperature coefficient of resistance (TCR), our experiment provides insight into the design and selection of SWCNT films
Sample 1 has two layers, each layer was prepared using 1 mL HiPco SWCNT solution; sample 2 has only one layer prepared from 2 mL HiPco SWCNT solution; sample 3 has one layer prepared from 2 mL NanoIntegris metallic SWCNTs; sample 4 has three layers, each layer was prepared from 2 mL HiPco SWCNT solution
Summary
Even though single-tube devices based on single-walled carbon nanotubes (SWCNTs) have excellent properties [1,2,3], these devices are usually fabricated randomly since it is very difficult to find two identical SWCNTs through currently available technology. The available technologies for SWCNT synthesis usually produce a mixture of nanotubes with varying diameters [4,5,6,7,8]. An as-prepared SWCNT can be either metallic or semiconducting depending on its chirality. Even though the separation of metallic SWCNTs from a mixture of both metallic and semiconducting SWCNTs has recently become possible [10], the repeatable fabrication of two identical SWCNT devices is further than a near future work. SWCNT films which contain SWCNTs with all kinds of chiralities are very attractive, since they suppress the differences among individual nanotubes
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