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Analysis of nanoscale liquids, including wetting and flow phenomena, is ascientific challenge with far reaching implications for industrialtechnologies. We report the conception, development, and application of anintegrated platform for the experimental characterization of liquids at thenanometer scale. The platform combines the sensing functionalities of anintegrated, two-dimensional electronic device array with in situ application ofhighly sensitive optical micro-spectroscopy and atomic force microscopy. Wedemonstrate the performance capabilities of the platform with an embodimentbased on an array of integrated, optically transparent graphene sensors. Theapplication of electronic and optical sensing in the platform allows fordifferentiating between liquids electronically, for determining a liquid'smolecular fingerprint, and for monitoring surface wetting dynamics in realtime. In order to explore the platform's sensitivity limits, we recordtopographies and optical spectra of individual, spatially isolated sessile oilemulsion droplets having volumes of less than ten attoliters. The resultsdemonstrate that integrated measurement functionalities based ontwo-dimensional materials have the potential to push lab-on-chip based analysisfrom the microscale to the nanoscale.

A platform for analysis of nanoscale liquids with an integrated sensor array based on 2-d material