Highly Sensitive NO2 Gas Sensors by Spark Ablation on CVD Graphene
Mudassir Husain (TU Delft - Electronic Components, Technology and Materials)
Leandro N. Sacco (TU Delft - Electronic Components, Technology and Materials, VSParticle)
Nigel Rising (VSParticle)
Elias Torres (Graphenea SA)
Sten Vollebregt (TU Delft - Electronic Components, Technology and Materials)
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Abstract
This work reports, for the first time, the use of spark ablation with impaction printing to selectively deposit silver (Ag) and gold (Au) nanoparticle (NP) functionalization on single-layer graphene (SLG) based gas sensors. This method avoids lithography and chemical processes, maintaining the device's quality while potentially lowering the fabrication costs. Ag-decorated sensors reveal a three-fold improvement in nitrogen dioxide (NO2) gas response over pristine-SLG sensors. We demonstrate detection capabilities down to 50 ppb at room temperature, negating the requirement for external thermal or photoactivation. In contrast to pristine or Au-decorated SLG sensors, Ag-decorated devices exhibit 96% recovery at room temperature (RT). These results highlight the potential of using spark ablation with impaction printing for functionalizing graphene-based sensors.