Abstract: Metal nanoparticles have been widely employed in chem. sensing due to their high reactivity toward various gases. The size of the metal nanoparticles often dictates their reactivity and hence their performance as chemiresistive sensors. Herein, we report that iptycene-containing poly(arylene ether)s (PAEs) have been shown to limit the growth of palladium nanoparticles (Pd NPs) and stabilize the Pd NPs dispersion. These porous PAEs also facilitate the efficient transport of analytes. Single-walled carbon nanotube (SWCNT)-based chemiresistors and graphene field-effect transistors (GFETs) using these PAE-supported small Pd NPs are sensitive, selective, and robust sensory materials for hydrogen gas under ambient conditions. Generalizable strategies including presorting SWCNTs with pentiptycene-containing poly(p-phenylene ethynylene)s (PPEs) and thermal annealing demonstrated significant improvements in the chemiresistive performance. The polymer:NP colloids produced in this study are readily synthesized and solution processable, and these methods are of general utility.
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General procedure: K2PdCl4 and the seven halogeno-derivatives of 7-azaindole(3Cl7AIH, 3Br7AIH, 4Cl7AIH, 4Br7AIH, 5Br7AIH, 3Br4Cl7AIH and5Br3Cl7AIH) were purchased from Sigma-Aldrich.In the syntheses of trans-[PdCl2(L)2] we followed the procedure described earlier for obtaining trans-[PdCl2(7AIH)2] [24] and trans-[PdCl2(7AI3CAH)2] [25]. A hot aqueous solution (10 cm3) of K2PdCl4(0.5 mmol) was mixed with the ethanol solution of the appropriateligand (1.0 mmol, 20 cm3) and stirred at 318 K for 48 h. The obtained pale yellow solids were filtered off,washed with ethanol andthen dried. The results of the elemental analysis are collected in Table 1S in the Supplementary Data.
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