Fig. 1 | Microsystems & Nanoengineering

Fig. 1

From: Mechanical drawing of two-dimensional transition metal dichalcogenides on paper for ultrasensitive gas sensing devices

Fig. 1

2D TMDCs mechanically drawn on a cellulose paper for sensitive and flexible gas sensors. a Schematic of the fabrication process of a TMDC-drawn, paper-based gas sensor. Photographs of the WSe2 and MoS2 pellets (b), silver electrodes drawn on the paper (c), and fabricated gas sensor with mechanically drawn WSe2 (d). e Photograph of the sensor that is folded in half, showing its high flexibility originated from the nature of the paper substrate. f–h SEM images of WSe2 drawn on a cellulose paper. WSe2 covers the surface of cellulose microfibers (f). Enlarged image shows WSe2 nanolayers with abundantly exposed edges (g). Cross-sectional view shows a ~1 μm-thick WSe2 sensing layer (h). The dashed line in (h) indicates the boundary between WSe2 and paper substrate

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