The present invention provides a method for detecting an analyte, comprising providing a sensor comprising a substrate coated with a free electron metal, a matrix layer disposed on the free electron metal, the matrix layer comprising an organic compound, wherein the organic compound has a boronic acid complexing moiety and, a boronic acid moiety complexed to the boronic acid complexing moiety; and contacting the sensor with the analyte to elicit a response; and measuring the response thereby detecting the analyte.