  Integrating multiple sensing capabilities into a single multimodal sensor
greatly enhances its applications for in-situ sensing and structural health
monitoring. However, the fabrication of multimodal sensors is complicated and
limited by the available materials and existing manufacturing methods that
often involve complex and expensive fabrication processes. In this study, a
high-temperature multimodal sensor is demonstrated by aerosol jet printing of
gold and ITO nanoparticle inks. The printed multimodal sensor for concurrent
strain and temperature sensing possesses a high gauge factor of 2.54 and
thermopower of 55.64 V/{\deg}C combined with excellent high-temperature thermal
stability up to 540 {\deg}C. Compared to traditional single-modality sensors,
the printed multimodal sensor significantly increases sensing capacity and
improves spatial resolution using microscale printed patterns. The study also
demonstrates that the strain sensor with integrated thermocouple enables
in-situ compensation of the temperature effect on strain sensing, significantly
improving strain measurement accuracy at high temperatures. By combining
aerosol jet printing with nanomaterial inks, a wide range of multifunctional
devices can be developed for a broad range of emerging applications.
