Improving LSPR sensing performance using multilayered composition graded Ag-Cu nanotriangle arrays.

Patterned nanotriangle arrays with composition graded and multilayered Ag-Cu were fabricated by a co-deposition and nanosphere lithography process. With the increase of the number of layers or constructing a continuum graded layer, the index sensitivity of the resulting nanotriangles kept on increasing, indicating that the graded boundaries can improve plasmon resonance sensing.