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Silviya Pehlivanova

ОПЕРАТИВНА ПРОГРАМА „РАЗВИТИЕ НА ЧОВЕШКИТЕ РЕСУРСИ“ ПРОЕКТ BG051PO001-3.3.06-0014 ЦЕНТЪР ПО МАТЕМАТИЧНО МОДЕЛИРАНЕ И КОМПЮТЪРНА СИМУЛАЦИЯ ЗА ПОДГОТОВКА И РАЗВИТИЕ НА МЛАДИ ИЗСЛЕДОВАТЕЛИ. Европейски съюз. Европейски социален фонд.

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Silviya Pehlivanova

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  1. ОПЕРАТИВНА ПРОГРАМА„РАЗВИТИЕ НА ЧОВЕШКИТЕ РЕСУРСИ“ПРОЕКТ BG051PO001-3.3.06-0014ЦЕНТЪР ПО МАТЕМАТИЧНО МОДЕЛИРАНЕ И КОМПЮТЪРНА СИМУЛАЦИЯ ЗА ПОДГОТОВКА И РАЗВИТИЕ НА МЛАДИ ИЗСЛЕДОВАТЕЛИ Европейски съюз Европейски социален фонд ELECTROCHEMICAL CHARACTERIZATION OF NANOSTRUCTURED DIAMOND LAYERS FOR ENERGY CONVERSION APPLICATION Silviya Pehlivanova

  2. Use of Solar energy Conversion of solar energy into electricity by artificial photosynthesis natural photosynthesis artificial photosynthesis • Efficient use of sunlight • Materials with improved physical, chemical and • biological properties

  3. Materials NCD+PhC Chlorophyll

  4. Sequence of the experiment 1. Deposition of nanocrystalline layers 2. Modification of diamond surfaces - O2-plasma - NH3-plasma - UV/O3-treatment 3. Immobilization with photosensitive molecules 4. Analyzing the effectiveness of the modification - Measurement of contact angles - X-ray photoelectron spectroscopy - Raman spectroscopy 5. Fotoelektrochemical research

  5. Deposition of diamond layers • Substrate preparation • Hot-Filament CVD-method • Operating parameters (gas Mixture 1% CH4 + 99% H2) NCD-layer HFCVD-installation

  6. Modification of diamond layers

  7. Immobilization with photosensitive molecules (Why Phthalocyanines? ) Immobilization of Mn-PhC • Preparation of the solution • Treatment of the NCD-layers (about 12 hours) (C96H144ClMnN8S8 )

  8. Fotoelektrochemical characterisation

  9. Cyclic voltammetry (C80H96ClMnN8О16) • Cycliccurves of unmodified NCD-sample without phthalocyanine • Under  illumination the electrode surface is stable and changes are not observed unmodified sample without PhC

  10. Cyclic voltammetry (C80H96ClMnN8О16) • Cyclic curves of NCD-samplewith phthalocyanine under and without illumination • There is a difference between the measurements obtained in dark and under illumination • The voltammetric curves clearly indicate both oxidation and reduction processes answerable for the detected photocurrent. unmodified sample with PhC

  11. Change of the electrochemical potential with time for short-duration illumination • Change of the potential at every switch on and off of the light source • The obtained results show that the functionalized diamond films are photosensitive

  12. THANK YOU FOR YOUR ATTENTION ОПЕРАТИВНА ПРОГРАМА„РАЗВИТИЕ НА ЧОВЕШКИТЕ РЕСУРСИ“ПРОЕКТ BG051PO001-3.3.06-0014ЦЕНТЪР ПО МАТЕМАТИЧНО МОДЕЛИРАНЕ И КОМПЮТЪРНА СИМУЛАЦИЯ ЗА ПОДГОТОВКА И РАЗВИТИЕ НА МЛАДИ ИЗСЛЕДОВАТЕЛИ Европейски съюз Европейски социален фонд

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