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Quantum dot self-decorated TiO 2 nanosheet

IUMRS-ICAM2013,Qingdao,Sep.22-28. Quantum dot self-decorated TiO 2 nanosheet. Feng-Min Zhao Tianjin University, China Sep. 24 2013. Contents. Introduction. 1. 2. Experimental. 3. Results and discussion. 4. Conclusions. Introduction. <5%. Solar Energy.

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Quantum dot self-decorated TiO 2 nanosheet

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  1. IUMRS-ICAM2013,Qingdao,Sep.22-28 Quantum dot self-decorated TiO2 nanosheet Feng-Min Zhao Tianjin University, China Sep. 24 2013

  2. Contents Introduction 1 2 Experimental 3 Resultsand discussion 4 Conclusions

  3. Introduction <5% Solar Energy Chem. Soc. Rev., 2009, 38, 253-278.

  4. Introduction truncated tetragonal bipyramid anatase Faceted Anatase Nature, 2008, 453, 638-641. Using MSC films, the fabricated all-solid-state, low-temperature sensitized solar cells that have 7.3 % efficiency, the highest efficiency yet reported. Faceted Anatase with Mesopores Nature, 2013, 495, 215-219

  5. Introduction Doping Science, 2001, 293, 269-271. Science, 2011, 331, 746-750. JACS, 2008, 130, 5018-5019.

  6. TBOT + HF(40 wt%) hydrothermally treated at 180oC 24h 72h 168h A-t: NaOH A-tH: NaOH 100 oC 24h A-tC: NaOH 500 oC 2h Experimental

  7. Results and discussion 24h 72h 168h

  8. Results and discussion 24h 72h %S{001}exp =S{001}/(S{101}+S{001}) =2a2/{4ab+2a2]*100 168h According to J. Phys. Chem. C 2012, 116, 7515 − 7519

  9. Results and discussion UV-vis DRS XPS O2s

  10. Results and discussion XPS EPR (110 K)

  11. Results and discussion Post-hydrothermal Post-calcination A-168H: 3.4 times higher than A-24 2.7 times higher than P-25 Photodegradation of RhB

  12. Results and discussion 1 3 4 2 5 Ag photo-deposition on A-168H(d) and A-24(e) TEM-EDS

  13. Conclusions • The long-time hydrothermal strategy and subsequent defect healing are the keys to obtain defect-free nanosheets decorated with TiO2 quantum dots. • The size of nanosheets progressively increases with t, but the {001} percentage almost remains unchanged (81–83%). • The surface Ti3+ defects suppress the photoactivity and could be removed by hydrothermal treatment or calcination. • The quantum dots provide a new and more effective charge separation and transfer pathway over the nanosheet surfaces, and promote the photoactivity significantly.

  14. Quantum dot self-decorated TiO2 nanosheet Thank You For Your Attention！

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