Provided is a catalyst article for simultaneously remediating the nitrogen oxides, particulate matter, and gaseous hydrocarbons present in diesel engine exhaust streams. An absorber layer containing elements of groups IB, IIIA and VIA may be formed by placing a substrate in a treatment chamber and performing atomic layer deposition of a group IB element andor one or more group IIIA elements from separate sources onto a substrate to form a film. These spacer structures facilitate enlargement of panels by increasing the supporting strength while maintaining a high aspect ratio.