3 research outputs found
Immunoassay with Single-Walled Carbon Nanotubes as Near-Infrared Fluorescent Labels
The
intrinsic photoluminescence of single-walled carbon nanotubes (CNTs)
in the near-infrared (NIR) above 1000 nm makes them promising candidates
for biological probes owing to low interference by bioorganic molecules
and deep tissue penetration. We here demonstrate an immunoassay by
using a NIR CNT labels conjugated to immunoglobulin G (IgG) antibodies.
Most of the CNT-conjugated IgG was successfully immunoprecipitated
with protein G-attached magnetic beads and eluted from them, which
was confirmed by the NIR emission of the conjugated CNTs at 1000–1200
nm. The photoluminescence intensity of the CNT labels was strong enough
to detect antigens at 600 pM by our simple procedures
Spectroscopic Characterization of Nanohybrids Consisting of Single-walled Carbon Nanotubes and Fullerodendron
<div><p>Hydrogen gas, which can be used in fuel cells to generate electricity, is considered the ultimate clean energy source. Recently, it was reported that a photo-induced electron transfer system consisting of single-walled carbon nanotubes (SWCNTs) and fullerodendrons shows photo-catalytic activity with a very high quantum yield for splitting water under visible light irradiation. However, the mechanism of high efficiency hydrogen generation is not yet clearly understood. We report here the spectroscopic characterizations of the SWCNT-fullerodendron composites. The results indicate two important fundamental properties of the composite system. First, fullerodendrons preferentially interact with the semiconducting SWCNTs instead of with their metallic counterparts. Second, the photo-induced electron transfer process from the C<sub>60</sub> moiety of fullerodendrons to SWCNTs occurs more efficiently with an increasing tube diameter.</p>
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Dimerization-Initiated Preferential Formation of Coronene-Based Graphene Nanoribbons in Carbon Nanotubes
We have investigated the growth mechanism of coronene-derived
graphene
nanoribbons (GNRs) using two different precursors: coronene and a
dimer form of coronene, so-called dicoronylene (C<sub>48</sub>H<sub>20</sub>). For both of the precursors, the formation of nanoribbon-like
materials inside carbon nanotubes (CNTs) was confirmed by transmission
electron microscope observations. Experimental and theoretical Raman
analysis reveals that the samples also encapsulated dicoronylene and
linearly condensed other coronene oligomers, which can be regarded
as analogues to GNRs. Interestingly, it was found that the present
doping condition of coronene yields dicoronylene prior to encapsulation
due to the thermal dimerization of coronene. These results indicate
that the dimerization before the encapsulation drives the preferential
formation of the coronene-based GNRs within CNTs