Graphene-based ppb level sulfur detector

A method for detection of sulfur comprising:

• patterning graphene with at least one pattern;
• depositing metal electrodes to form a first device for each pattern;
• functionalizing the patterned graphene;
• attaching at least one type of nanoparticles to the functionalized patterned graphene to form a chemiresistive second device for each type of nanoparticles, wherein said functionalizing the patterned graphene and attaching nanoparticles to the functionalized patterned graphene comprises UV-activated chemical functionalization of graphene and attachment of nanoparticles through a chemical linking molecule;
• forming a sensor comprising at least one first device and at least one second device;
• establishing a baseline electrical response for the sensor;
• exposing the sensor to an analyte in the gas or liquid phase;
• detecting an analyte electrical response in the sensor after exposure to the analyte;
• determining whether sulfur is present in the analyte by comparing the baseline electrical response and the analyte electrical response;
• and
• recovering the sensor for future use.