Multi‐Sensing Platform Based on 2D Monoelement Germanane

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Abstract
Covalently functionalized germanane is a novel type of fluorescent probe that can be employed in material science and analytical sensing. Here, a fluorometric sensing platform based on methyl‐functionalized germanane (CH 3 Ge) is developed for gas (humidity and ammonia) sensing, pH (1–9) sensing, and anti‐counterfeiting. Luminescence (red–orange) is seen when a gas molecule intercalates into the interlayer space of CH 3 Ge and the luminescence disappears upon deintercalation. This allows for direct detection of gas absorption via fluorometric measurements of the CH 3 Ge. Structural and optical properties of CH 3 Ge with intercalated gas molecules are investigated by density functional theory (DFT). To demonstrate real‐time and on‐the‐spot testing, absorbed gas molecules are first precisely quantified by CH 3 Ge using a smartphone camera with an installed color intensity processing application (APP). Further, CH 3 Ge‐paper‐based sensor is integrated into real food packets (e.g., fish and milk) to monitor the shelf life of perishable foods. Finally, CH 3 Ge‐based rewritable paper is applied in water jet printing to illustrate the potential for secret communication with quick coloration and good reversibility by water evaporation.
Funding Information
  • Grantová Agentura České Republiky (GA22‐33284S, 19–26896X)

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