TY - JOUR
T1 - Carbon nanohorn-porphyrin dimer hybrid material for enhancing light-energy conversion
AU - Pagona, Georgia
AU - Zervaki, Galateia E.
AU - Sandanayaka, Atula S.D.
AU - Ito, Osamu
AU - Charalambidis, Georgios
AU - Hasobe, Taku
AU - Coutsolelos, Athanassios G.
AU - Tagmatarchis, Nikos
PY - 2012/5/3
Y1 - 2012/5/3
N2 - The covalent grafting through a rigid ester bond of a dimeric porphyrin [(H 2P) 2] and carbon nanohorns (CNHs) was accomplished. The newly formed CNH-(H 2P) 2 hybrid was found to be soluble or dispersible in several organic solvents. Application of diverse spectroscopic techniques verified the successful formation of the CNH-(H 2P) 2 hybrid material. In addition, thermogravimetric analysis revealed the amount of (H 2P) 2 loading onto CNHs, and TEM studies showed the characteristic secondary spherical superstructure morphology of the hybrid material. Efficient fluorescence quenching of (H 2P) 2 in the CNH-(H 2P) 2 hybrid suggests that photoinduced events occur from the photoexcited (H 2P) 2 to CNHs. Nanosecond transient absorption spectroscopy revealed the formation of transient species such as (H 2P) 2 •+ and CNH •- by photoinduced charge separation in CNH-(H 2P) 2. Additional proof for the photoinduced charge-separated state CNH •--(H 2P) 2 •+ was obtained, from which the electron mediates to added hexyl viologen dication (HV 2+). Finally, the CNH-(H 2P) 2 was adsorbed on nanostructured SnO 2 electrode, to construct a photoactive electrode, which reveals photocurrent and photovoltage responses with an incident photon-to-current conversion efficiency value as large as 9.6%, without the application of any bias voltage.
AB - The covalent grafting through a rigid ester bond of a dimeric porphyrin [(H 2P) 2] and carbon nanohorns (CNHs) was accomplished. The newly formed CNH-(H 2P) 2 hybrid was found to be soluble or dispersible in several organic solvents. Application of diverse spectroscopic techniques verified the successful formation of the CNH-(H 2P) 2 hybrid material. In addition, thermogravimetric analysis revealed the amount of (H 2P) 2 loading onto CNHs, and TEM studies showed the characteristic secondary spherical superstructure morphology of the hybrid material. Efficient fluorescence quenching of (H 2P) 2 in the CNH-(H 2P) 2 hybrid suggests that photoinduced events occur from the photoexcited (H 2P) 2 to CNHs. Nanosecond transient absorption spectroscopy revealed the formation of transient species such as (H 2P) 2 •+ and CNH •- by photoinduced charge separation in CNH-(H 2P) 2. Additional proof for the photoinduced charge-separated state CNH •--(H 2P) 2 •+ was obtained, from which the electron mediates to added hexyl viologen dication (HV 2+). Finally, the CNH-(H 2P) 2 was adsorbed on nanostructured SnO 2 electrode, to construct a photoactive electrode, which reveals photocurrent and photovoltage responses with an incident photon-to-current conversion efficiency value as large as 9.6%, without the application of any bias voltage.
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U2 - 10.1021/jp302178q
DO - 10.1021/jp302178q
M3 - Article
AN - SCOPUS:84860516675
SN - 1932-7447
VL - 116
SP - 9439
EP - 9449
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
IS - 17
ER -