Fabricating and printing chemiresistors based on monolayer-capped metal nanoparticles

Yana Milyutin, Manal Abud-Hawa, Viki Kloper-Weidenfeld, Elias Mansour, Yoav Y. Broza, Gidi Shani, Hossam Haick

Published: 2021-05-18 DOI: 10.1038/s41596-021-00528-y

Extended

Extended Data Fig. 1

ad , TEM characterization of gold nanoparticles with different organic ligands: dodecanethiol ( a ); 2-ethylhexanethiol ( b ); analysis of core size distribution of dodecanethiol ( c ); analysis of core size distribution of 2-ethylhexanethiol ( d ).

Extended Data Fig. 2 Topology characterization after printing 20±0.3 nl MCGNP solutions.

a , b , Optical microscopic images of 8-sensor chips made of dodecanethiol-capped ( a ) and 2-ethylhexanethiol-capped ( b ) gold nanoparticle films. The different morphologies appearing in a and b could be related to the application of different chemistries, which, in turn, lead to different surface tensions and evaporation process of the solvent. c , Magnification of the dodecanethiol-capped gold nanoparticle sensor around the coffee ring shape. d , XPS elemental surface analysis of dodecanethiol-caped gold nanoparticles on SiO 2 surface, as a representative example (Supplementary Fig. 16 ).

Extended Data Fig. 3

ac , Contact angle measurements by optical goniometery of: SU-8 without oxygen plasma ( a ); SU-8 with oxygen plasma ( b ); and SiO 2 surface ( c ). Higher contact angle indicates higher hydrophobicity of the surface, which, in turn, better allows to hold the drops inside the barrier.

Extended Data Fig. 4

ad , SEM images of SiO 2 barrier after lift-off process ( a , b ); and SU-8 2002 barrier made by photolithography process ( c , d ).

Extended Data Fig. 5

Schematic description of the droplets behavior and effect of the microbarrier height on the evaporation of MCGNP solution droplet.

Extended Data Fig. 6 Relationship between the microbarrier height and printed MCGNP solution.

a , b , Values of VI ( a ) and amplitude ( b ) of response to decane as a function of deposited volume of ethylhexanethiol-capped gold nanoparticle solution. c , d , Values of VI ( c ) and amplitude ( d ) of response to decane as a function of deposited volume of dodecanethiol-capped gold nanoparticle solution. Note: the VI is a relative measure of the variance of the response, and the amplitude is a measure of its level. For optimized devices, one has to look for the lowest possible VI while keeping the amplitude of the sensing response as high as possible.

Extended Data Fig. 7

Boxplot of the extracted feature of 24 dodecanethiol-capped gold nanoparticle sensors for various storage conditions: vacuum, nitrogen and room air.

Extended Data Fig. 8

Schematic depiction of the MCGNP synthesis process.

Extended Data Fig. 9

Schematics of the reduction step during the MCGNP synthesis.

Supplementary information

Supplementary Information

Supplementary Data 1–4, Supplementary Manual 1–3 and Supplementary Figs. 1–15.

Supplementary Software 1

The electrodes design for the photolithography process

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