Surface Properties and Coatings PP-17
Synthesis and Characterization of Boron Nitride Thin Films on Glass Substrate
Duygu G ökdai1, A lev Akpınar Borazan1, Nuran A y2
'B ile c ik S eyh E d e b a li U n iv e rs ity , D e p a rtm e n t o f C h e m ica l and P rocess E n g in e e rin g , B ilecik, T u rk e y
2A n a d o lu U n iv e rs ity , D e p a rtm e n t o f M a te ria ls S c ie n ce a n d E n g in e e rin g , Eskişehir, T u rk e y
Boron n itrid e (BN ), one o f th e h ig h -te ch p ro d u c ts o f boron, is a m aterial w ith s u p e rio r p ro p e rtie s such as re fra c to ry p ro p e rtie s at high tem p era ture s, high th e rm a l shock resistance, high th e rm a l c o n d u c tiv ity , e le ctrica l insulation, chem ical and m echanical sta bility, lu b ric a tio n and easy process ability. Thanks to th is fe atures th in h-BN c o a tin g s fin d a p p lic a tio n s in several fie ld s such as p ro te c tiv e c o a tin g fo r o xid atio n, h u m id ity and corrosion. In th is s tu d y b oron n itrid e th in film s on glass su bstrates were m a n u fa ctu re d fro m b o ric acid and urea so lu tio n by d ip -c o a tin g so l-ge l te chn iqu e. D iffe re nt co n c e n tra tio n s o f m e ta n o lic b o ric acid s o lu tio n s w ere s tu d ie d to fo rm BN th in film co atin gs on glass substrate. The im p re g n a te d th in film s p ro d u ce d via th is te c h n iq u e w ere heated to 550 °C at a rate o f 5 °C /m in fo r 2 h in a fu rn ace w ith N2 atm osphere. Scanning e le ctro n m ic ro s c o p y (Zeiss Supra 4 0 V P ) was e m p lo ye d to in ve stiga te th e BN c o a tin g m orph olo gie s. The phases o f th e n itrid a tio n p ro d u c ts w ere ch aracte rize d by X-ray d iffra c tio n (XRD, Panalytical, Em pyrean). Surface roughness o f th in film s was d e te rm in e d by using A to m ic -F o rc e M icroscopy (AFM ). The best m olar c o n c e n tra tio n o f th in film s was d e c id e d a cco rd in g to th e stru c tu ra l and roughness p ro p e rtie s o f m a n u fa ctu re d samples.
Keywords: Boron nitride, th in film , d ip -c o a tin g , surface p ro p e rtie s Surface Properties and Coatings
PP-18
Mesoporous Sol-Gel Based Silica Thin Films w ith O rdered Pore O rientation as A ntireflective Coatings on Glass
Mikael Järn1, Lina Grund Bäck2, Anne Andersson3, Stefan Karlsson2 'RISE R esearch In s titu te s o f S w e d e n , M a te ria ls A n d S u rfa c e C h e m is try 2RISE R esearch In s titu te s o f S w e d e n , Glass
3RISE R esearch In s titu te s o f S w e d e n , M e a s u re m e n t T e c h n o lo g y
A n tire fle c tiv e co atin gs on glass have increasing a pp lica tion s, on e.g. cover glass o f PV m odules, d isp lay glass, sp ecta cle lenses o r w in d o w glazing's. Sol-gel d erive d m eso po ro us c o a tin g s can be tu n e d b o th in te rm s o f p o ro s ity and thickness, th u s a llo w in g tu n in g o f th e re fra ctive index. A d d itio n a lly , the sol-gel app ro ach is b o tto m -u p , w hich fa c ilita te s easy upscaling. In the cu rre n t w o rk we present d ip -c o a te d m esoporous SiO2 co atin gs o f d iffe re n t p ore o rie n ta tio n and film th ickne ss p re pared on m icro scop e glass slides and silicon wafers. The silica c o a tin g s w ere d e rive d fro m TEOS (te tra o rth o s ilic a te s ) m ixed w ith ethanol and d ilu te d HCl. Hexagonal and
