Gas characterization system having a preconcentrator

A gas sensor system, comprising:

• one or more gas preconcentrator modules, each gas preconcentrator module including a substrate having a top surface with a gas adsorbent material attached to the top surface and further including an integral electrical heater element;
• and
• a plurality of gas sensor modules in fluid communication with the one or more gas preconcentrator modules, wherein the plurality of gas sensor modules includes at least a first gas sensor module with a first chemical responsiveness and a second gas sensor module with a second chemical responsiveness different from the first chemical responsiveness,
• wherein the plurality of gas sensor modules comprise electrochemical gas sensors with differing chemical responsivities provided by differing working electrode potentials, filters, electrolytes or electrode materials, and
• wherein at least one electrochemical gas sensor includes:
• a substrate having a top surface and a bottom surface, wherein a first part of the top surface has a gas adsorbent material attached thereto and a first electrical heater element attached to a first part of the bottom surface opposite the first part of the top surface, wherein a second part of the top surface has an interdigitated array of electrodes attached thereto and a metal oxide coating attached to the second part of the top surface and covering the interdigitated array of electrodes, and wherein a second electrical heater element is attached to a second part of the bottom surface opposite the second part of the top surface.