1. Metoda hydrotermalna przy zastosowaniu surfaktantów o różnej jonowości
pozwoliła na otrzymanie siarczku molibdenu MoS2 w formie warstwowej,
co potwierdzono metodą dyfrakcji promieni rentgenowskich (wzrost odległości międzypłaszczyznowej) oraz spektroskopii Ramana (zmniejszenie ilości warstw względem materiału objętościowego).
2. Zastosowanie metody hydrotermalnej do osadzania MoS2 na warstwach TiO2-L nie umożliwiło uzyskania pożądanych właściwości fotoelektrochemicznych układów TiO2/MoS2, które ulegały degradacji w trakcie pracy ogniwa.
3. Metoda elektroosadzania, z udziałem materiału osadzanego w formie zawiesiny
proszkowej, z powodzeniem może zostad zastosowana do nanoszenia MoS2 na TiO2
(warstwy i nanorurki), a optymalne warunki to U = 1.2 V i t = 40 s.
4. Poprawa właściwości fotoelektrochemicznych TiO2 związana z utowrzeniem
heterostruktury TiO2/MoS2 obejmuje: wzrost wartości fotoprądu, bardziej ujemne
wartości potencjału płaskich pasm, zwiększenie ilości wydzielonego wodoru
w stosunku do czystego TiO2 oraz długoczasową stabilnośd.
5. Syntezy nanokryształów TiO2 metodą hydrotermalną pokazały, że wzrost ilości
prekursora jonów tytanu (KTNWs) powoduje zwiększenie wymiarów nanokryształów, natomiast ilośd zastosowanego surfaktantu (mocznik) determinuje ich kształt. Zmiana parametrów nie wpływa jednak na skład fazowy i wartośd energii przerwy wzbronionej Eg. Wszystkie uzyskane materiały składają się z anatazu, a wartośd Eg
wynosi 3.30 eV.
6. Jednoczesne zwiększenie ilości prekursora i surfaktantu podczas syntezy
nanokryształów TiO2 wpływa korzystnie na właściwości elektrokatalityczne proszków,
powodując poszerzenie zakresu potencjału zeta ζ, co oznacza wzrost stabilności
dyspersji. Najlepszymi właściwościami fotokatalitycznymi charakteryzują się
nanokryształy o wydłużonym kształcie.
7. Reakcja chemiczna pomiędzy prekursorem jonów miedzi i wodorotlenkiem sodu, bez oraz z udziałem kwasu L-askorbinowego prowadzi do otrzymania odpowiednio,
154
8. Modyfikacja nanokryształów TiO2 tlenkami miedzi prowadzona może byd w sposób
analogiczny do syntezy tlenków miedzi, a także poprzez modyfikacje tej metody: zastosowanie ultradźwięków do ogrzewania i ujednorodniania mieszaniny reakcyjnej, czy też użycie chitozanu jako "kleju” łączącego TiO2 z CuxO. Zastosowane metody
modyfikacji TiO2 nie prowadzą jednak do poprawy właściwości fotokatalitycznych
zarówno w zakresie UV oraz UV-vis.
9. Metoda elektroosadzania posłużyd może do otrzymywania warstw tlenku miedzi (I) zarówno na tytanie jak i nanorurkach TiO2. Parametry wpływające na morfologię osadzanego związku to pH elektrolitu, różnica potencjałów oraz czas trwania procesu.
10. Elektroosadzanie prowadzone z udziałem mieszaniny, CuSO4 i kwasu mlekowego,
o pH=12, przy zastosowaniu potencjału -0.36 V i krótkiego czasu reakcji, umożliwiło uzyskanie nieciągłej warstwy Cu2O. Efekt ten jest korzystny jest z punktu widzenia
właściwości fotoelektrochemicznych powstałego heterozłącza TiO2-NT/Cu2O,
ponieważ umożliwia absorpcję zarówno w zakresie UV (TiO2) jak i vis (Cu2O).
11. Otrzymany układ TiO2-NT/Cu2O z powodzeniem został zastosowany jako elektroda podczas stanowiącego alternatywę do fotokatalizy – fotoelektrokatalitycznego rozkładu błękitu metylenowego, w efekcie czego wykazano poprawę właściwości względem niemodyfikowanego tlenku tytanu (IV).
12. Uzyskane wyniki badao pozwoliły na zaproponowanie występowania rodzaju
heterozłącza półprzewodników n-n typu II dla układów TiO2/MoS2 oraz TiO2/Cu2O oraz wyjaśnienie przeciwdziałania procesom fotokorozji półprzewodników
155
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