Fig. 3.

Response toward acetone, THF, and DMMP of sensors fabricated on the surface of weighing paper by mechanical abrasion of PENCILs comprising compressed blends of nC (graphite, SWCNTs, and MWCNTs) and S¹ at different mass ratios (1:0, 1:1, 1:2, and 1:5). Change in conductance (represented as –ΔG/G₀, %) with time of devices exposed to acetone (A), THF (B), and DMMP (C) for 30 s. Quantitative comparison of sensing response (–ΔG/G₀, %) toward acetone (D), THF (E), and DMMP (F) for three different forms of nC (graphite, SWCNT, and MWCNT) blended with S¹ at four different mass ratios (1:0, 1:1, 1:2, and 1:5). Vertical error bars represent SD from the mean based on three exposures of three sensors to each of the analytes.