Details
| Original language | English |
|---|---|
| Pages (from-to) | 13659-13668 |
| Number of pages | 10 |
| Journal | The Journal of Physical Chemistry C |
| Volume | 122 |
| Issue number | 25 |
| Early online date | 6 Apr 2018 |
| Publication status | Published - 28 Jun 2018 |
Abstract
Lead sulfide quantum dot nanocrystal (QDNC) sensitized TiO 2 nanotubes have been fabricated using a simple, wet chemical method that is both time- and cost-effective. A single precursor source containing both Pb and S has been employed, with oleylamine as a linker molecule to synthesize the PbS under an ambient pressure based approach. This approach serves to assemble the QDNCs on a TiO 2 nanotube surface. Surface characterization was performed using electron microscopy, X-ray diffraction, and elemental analysis, indicating the formation of PbS quantum dots along the nanotube walls and intertubular spacing. The optoelectronic, photoelectrochemical, and photocatalytic properties of the composite heterostructure have been characterized using absorbance spectroscopy, electrochemical studies (including efficiency measurements), and methylene blue conversion as a probe. A 24-fold increase in the photocurrent of TiO 2-PbS heterostructure over bare TiO 2 nanotube has been observed. Electrochemical impedance measurements of the TiO 2 nanotube sample indicate donor density of ∼4.5 × 10 19 cm -3 while TiO 2/PbS heterostructure shows an n-n photoactive heterojunction with a donor density of ∼2.3 × 10 20 cm -3. A 12% increase in photocatalytic activity and theoretical estimates suggesting almost 40-fold enhancement toward value-added product synthesis with PbS inclusion are presented.
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Energy(all)
- Chemistry(all)
- Physical and Theoretical Chemistry
- Materials Science(all)
- Surfaces, Coatings and Films
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In: The Journal of Physical Chemistry C, Vol. 122, No. 25, 28.06.2018, p. 13659-13668.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - One-Pot Fabrication of High Coverage PbS Quantum Dot Nanocrystal-Sensitized Titania Nanotubes for Photoelectrochemical Processes
AU - Pathak, Pawan
AU - Podzorski, Mateusz
AU - Bahnemann, Detlef
AU - Subramanian, Vaidyanathan Ravi
N1 - Funding information: RSV gratefully acknowledges NSF funding (CBET 1337050) for partially supporting the initial part of this project. RSV would like to thank the the Alexander von Humboldt Foundation for supporting him to collaborate with Prof. Bahnemann’s Laboratory. RSV thanks Dr. Mo Ahmedian for HRTEM studies. He also acknowledges NSF - EPSCOR UG support for MP.
PY - 2018/6/28
Y1 - 2018/6/28
N2 - Lead sulfide quantum dot nanocrystal (QDNC) sensitized TiO 2 nanotubes have been fabricated using a simple, wet chemical method that is both time- and cost-effective. A single precursor source containing both Pb and S has been employed, with oleylamine as a linker molecule to synthesize the PbS under an ambient pressure based approach. This approach serves to assemble the QDNCs on a TiO 2 nanotube surface. Surface characterization was performed using electron microscopy, X-ray diffraction, and elemental analysis, indicating the formation of PbS quantum dots along the nanotube walls and intertubular spacing. The optoelectronic, photoelectrochemical, and photocatalytic properties of the composite heterostructure have been characterized using absorbance spectroscopy, electrochemical studies (including efficiency measurements), and methylene blue conversion as a probe. A 24-fold increase in the photocurrent of TiO 2-PbS heterostructure over bare TiO 2 nanotube has been observed. Electrochemical impedance measurements of the TiO 2 nanotube sample indicate donor density of ∼4.5 × 10 19 cm -3 while TiO 2/PbS heterostructure shows an n-n photoactive heterojunction with a donor density of ∼2.3 × 10 20 cm -3. A 12% increase in photocatalytic activity and theoretical estimates suggesting almost 40-fold enhancement toward value-added product synthesis with PbS inclusion are presented.
AB - Lead sulfide quantum dot nanocrystal (QDNC) sensitized TiO 2 nanotubes have been fabricated using a simple, wet chemical method that is both time- and cost-effective. A single precursor source containing both Pb and S has been employed, with oleylamine as a linker molecule to synthesize the PbS under an ambient pressure based approach. This approach serves to assemble the QDNCs on a TiO 2 nanotube surface. Surface characterization was performed using electron microscopy, X-ray diffraction, and elemental analysis, indicating the formation of PbS quantum dots along the nanotube walls and intertubular spacing. The optoelectronic, photoelectrochemical, and photocatalytic properties of the composite heterostructure have been characterized using absorbance spectroscopy, electrochemical studies (including efficiency measurements), and methylene blue conversion as a probe. A 24-fold increase in the photocurrent of TiO 2-PbS heterostructure over bare TiO 2 nanotube has been observed. Electrochemical impedance measurements of the TiO 2 nanotube sample indicate donor density of ∼4.5 × 10 19 cm -3 while TiO 2/PbS heterostructure shows an n-n photoactive heterojunction with a donor density of ∼2.3 × 10 20 cm -3. A 12% increase in photocatalytic activity and theoretical estimates suggesting almost 40-fold enhancement toward value-added product synthesis with PbS inclusion are presented.
UR - http://www.scopus.com/inward/record.url?scp=85049407303&partnerID=8YFLogxK
U2 - 10.1021/acs.jpcc.8b00120
DO - 10.1021/acs.jpcc.8b00120
M3 - Article
VL - 122
SP - 13659
EP - 13668
JO - The Journal of Physical Chemistry C
JF - The Journal of Physical Chemistry C
IS - 25
ER -