Abstract
AbstractThe charge interaction and corresponding doping effect between single‐walled carbon nanotubes (SWNTs) and various fullerene derivatives, namely, C60, phenyl‐C61‐butyric acid methyl ester (PC61BM), methano‐indenefullerene (MIF), 1′,1″,4′,4″‐tetrahydrodi[1,4]methanonaphthaleno[5,6]fullerene (ICBA), 1,4‐bis(dimethylphenylsilylmethyl)[60]fullerene (SIMEF‐1), and dimethyl(orthoanisyl) silylmethyl(dimethylphenylsilylmethyl)[60]fullerene (SIMEF‐2), are investigated. A variety of analytical techniques, including field‐effect transistors (FETs) made of horizontally aligned arrays of SWNTs, is used as a means of investigation. Data from different measurements have to be used to obtain a concrete evaluation for the fullerene‐applied SWNTs. The data collectively points toward the conclusion that fullerenes with high molecular orbital energy levels, namely, MIF, SIMEF‐1, SIMEF‐2, and PC61BM, induce p‐type doping, while fullerenes with low molecular orbital energy levels, namely, ICBA and C60, induce n‐type doping on the carbon nanotubes. Nevertheless, the SWNTs retained p‐type characteristics because n‐doping induced by the fullerenes are weak compared to the p‐doping of the water and oxygen on carbon nanotubes. This means that fullerene derivatives have the ability to fine‐tune the energy levels of carbon nanotubes, which can play a crucial role in carbon nanotube‐based electronics, such as solar cells, light‐emitting devices, and FETs.
Highlights
One-dimensional single-walled carbon nanotubes (SWNTs) show outstanding ballistic transport properties and unique geometry of an assembled network
There has not been a conclusive study on the doping effect of fullerenes on SWNTs, but there have been many reports on photo-induced electron transfer from semiconducting SWNTs to C60.69-72 it is absolutely paramount that we study the charge interaction between SWNTs and various fullerene derivatives without photo induction, and the resulting effect in terms of energetics.[73,74,75]
It was found that the fullerene derivatives induce charge transfer depending on their highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) levels
Summary
One-dimensional single-walled carbon nanotubes (SWNTs) show outstanding ballistic transport properties and unique geometry of an assembled network. There has not been a conclusive study on the doping effect of fullerenes on SWNTs, but there have been many reports on photo-induced electron transfer from semiconducting SWNTs to C60.69-72 it is absolutely paramount that we study the charge interaction between SWNTs and various fullerene derivatives without photo induction, and the resulting effect in terms of energetics.[73,74,75]. This work uncovers the effect of fullerene derivatives on SWNT in terms of energetics and electronic properties. The doping effect is marginal, it is possible to tune the energetics of SWNTs using fullerenes, which will benefit greatly in designing highperformance SWNT-based electronics
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