TY - JOUR
T1 - 3D Spatially Controlled Chemical Functionalization on Alumina Membranes
AU - Falcaro, Paolo
AU - Trinchi, Adrian
AU - Doherty, Cara M.
AU - Buso, Dario
AU - Costacurta, Stefano
AU - Hill, Anita J.
AU - Patelli, Alessandro
AU - Scopece, Paolo
AU - Marmiroli, Benedetta
AU - Amenitsch, Heinz
AU - Lasio, Barbara
AU - Pinna, Alessandra
AU - Innocenzi, Plinio
AU - Malfatti, Luca
PY - 2014
Y1 - 2014
N2 - Among the myriad microfabrication approaches, Deep X-ray Lithography (DXRL) takes advantage of the high penetration depth of hard X-rays. For the first time, this feature has been exploited for the precise control of surface chemical functionalities on a thick porous ceramic material. As a proof of concept, porous alumina membranes with controlled thickness (50 μm) have been chosen to test the potential of DXRL. The Al2O3 membranes were decorated with fluoro- and amino-silanes. These functionalized ceramic membranes were exposed to hard X-rays in a synchrotron facility, which allowed for the selective decomposition of the chemical functionalities in controlled areas. The water contact angle of hydrophobic-functionalized samples was measured to confirm the decomposition of the fluoro-silane in the exposed area, and water diffusion through the 200 nm pores of the alumina membranes was observed to occur only in the exposed area. The patterned amino-functionalized Al2O3 samples were tested with an alcoholic solution containing Au cations, where it was found that gold nanoparticles only formed in the unexposed areas, whereas the amino functionality survived the radiation damage induced by the X-rays.
AB - Among the myriad microfabrication approaches, Deep X-ray Lithography (DXRL) takes advantage of the high penetration depth of hard X-rays. For the first time, this feature has been exploited for the precise control of surface chemical functionalities on a thick porous ceramic material. As a proof of concept, porous alumina membranes with controlled thickness (50 μm) have been chosen to test the potential of DXRL. The Al2O3 membranes were decorated with fluoro- and amino-silanes. These functionalized ceramic membranes were exposed to hard X-rays in a synchrotron facility, which allowed for the selective decomposition of the chemical functionalities in controlled areas. The water contact angle of hydrophobic-functionalized samples was measured to confirm the decomposition of the fluoro-silane in the exposed area, and water diffusion through the 200 nm pores of the alumina membranes was observed to occur only in the exposed area. The patterned amino-functionalized Al2O3 samples were tested with an alcoholic solution containing Au cations, where it was found that gold nanoparticles only formed in the unexposed areas, whereas the amino functionality survived the radiation damage induced by the X-rays.
U2 - 10.1166/sam.2014.1841
DO - 10.1166/sam.2014.1841
M3 - Article
SN - 1947-2935
VL - 6
SP - 1520
EP - 1524
JO - Science of Advanced Materials
JF - Science of Advanced Materials
IS - 7
ER -