Abstract
We investigated the changes in the first- and second-order Raman spectra of suspended crossed ultralong carbon nanotube (CNT) junctions using different laser excitation energies. The CNT junctions were in situ fabricated by growing CNTs in two perpendicular directions using chemical vapor deposition (CVD) technique. Raman spectra substantiated the structural deformation by the compression between CNTs in the junction. I–V curves of crossed CNT junctions showed the linear behavior. These crossed CNT–CNT junctions have higher current values than individual CNTs. The coexisting suspended and unsuspended CNTs on the substrate showed higher sensitivity to infrared (IR) radiation but longer response time than those with only suspended ones or CNT junctions.
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