  Carbon nanotubes (CNTs) make an ideal one-dimensional (1D) material platform
for the exploration of exotic physical phenomena under extremely strong quantum
confinement. The 1D character of electrons, phonons and excitons in individual
CNTs features extraordinary electronic, thermal and optical properties. Since
the first discovery, they have been continuing to attract interest in various
disciplines, including chemistry, materials science, physics, and engineering.
However, the macroscopic manifestation of such properties is still limited,
despite significant efforts for decades. Recently, a controlled vacuum
filtration method has been developed for the preparation of wafer-scale films
of crystalline chirality-enriched CNTs, and such films immediately enable
exciting new fundamental studies and applications. In this review, we will
first discuss the controlled vacuum filtration technique, and then summarize
recent discoveries in optical spectroscopy studies and optoelectronic device
applications using films prepared by this technique.
