Effects of fullerene encapsulation on structure and photophysical properties of porphyrin-linked single-walled carbon nanotubes

Abstract

Fullerene-encapsulating single-walled carbon nanotubes (C(60)@SWNT) linked with porphyrins by a short bridge have been prepared for the first time. Steady state and time-resolved spectroscopies demonstrated the initial formation of an exciplex state, followed by a charge-separated state.

Self-assembling porphyrins and phthalocyanines for photoinduced charge separation and charge transport

“…10). 101 Encapsulation of C 60 into open-ended SWNT (p-SWNT) with diameters of 1.3-1.6 nm is conducted by a sublimation method (C 60 @SWNT). Then, surfactant-wrapped C 60 @SWNT is reacted with p-iodophenyl diazonium salt in aqueous solution, followed by treatment with the in situ generated diazonium salt in ODCB to yield pre-functionalized peapod with p-iodophenyl groups (C 60 @SWNT-PhI).…”

“…The transient absorption component spectrum of p-SWNT-ZnP shows a negative signal in the full range of the measurement (500-1100 nm) with a lifetime (t) of 0.3 ps. 101 This signal can be assigned to the ground state photobleaching due to the SWNT absorptions of M 11 (the lowest transitions between van Hove singularities in the valence band (VB) and CB of metallic SWNT) and S 22 (the second lowest transitions in semiconducting SWNT). The spectrum of p-SWNT-PhI also exhibits a similar negative signal.…”

“…102,103 The absorption changes recorded upon the excitation of C 60 @SWNT-ZnP at 420 nm differ from those of p-SWNT-ZnP. 101 In addition to the negative signal of the ground state photobleaching of the C 60 @SWNT moiety, the exciplex absorption appears, but the lifetime (t = 24 ps) is much shorter than that of p-SWNT-ZnP (t = 1073 ps). Furthermore, an additional long-lived component (t 4 2 ns) with two minima at 560 and 600 nm emerges.…”

A glassy carbon electrode modified with a nickel(II) norcorrole complex and carbon nanotubes for simultaneous or individual determination of ascorbic acid, dopamine, and uric acid

“…The It's similar to the property of porphyrin. The red-shifted bands by 4-8 nm suggest that there is an electronic communication between the CNT and NiNC in the ground state [24,25]. For the reason that the large loop π-electron in NiNC exists the strong electronic effect with the delocalized π-electron on CNT, the absorption intensity in the visible area for NiNC is weakened and followed by the redshift of the absorption bands [26].…”

New hybrid materials with porphyrin-ferrocene and porphyrin-pyrene covalently linked to single-walled carbon nanotubes

“…Notably, such results are in agreement with earlier studies based on other hybrid materials composed of different porphyrins bonded to SWCNTs, CNHs and graphene. 7,28,29 Insight on the electronic interplay between H 2 P-Fc 8 and H 2 P-pyr 9, respectively, and SWCNTs in the excited state of hybrids 11 and 12 is derived from photoluminescence studies. Upon excitation at 420 nm, the strong fluorescence emission of porphyrin 8 at 653 nm was significantly quenched by the presence of SWCNTs in the SWCNT-(H 2 P-Fc) 11, when measurements performed with matching absorption of H 2 P-Fc at the excitation wavelength (Fig.…”