Tuning the Interfacial Chemistry of Nanoparticle Assemblies via Spin‐Coating: From Single Sensors to Monolithic Sensor Arrays

• DOI: 10.1002/admi.202301058
• Publication Date: 2024-05-07T05:55:00Z
• Authors: Chih‐Yin Liu; Sophia C. Bittinger; Ahir Bose; Andreas Meyer; Hendrik Schlicke; Tobias Vossmeyer
• Keywords: Spin Coating

Abstract Sensor arrays based on gold nanoparticle (GNP) films are promising candidates for numerous applications, including medical diagnosis and health monitoring. Their economic fabrication, however, remains challenging. This study presents a facile route to GNP chemiresistors with tunable properties via layer‐by‐layer spin‐coating (LbL‐SC). Key steps involve the alternating deposition of dodecylamine‐stabilized GNPs mixtures monothiols (MTs) 1,9‐nonanedithiol (9DT). The 9DT molecules serve reinforce growing film cross‐linking while MT ligands used tune interfacial chemistry assembly. Hence, by employing differently functionalized MTs sensors' chemical selectivity can easily be adjusted. Further, varying MT‐9DT ratio adjusting size sensitivity tuned along conductivity optical films. In general, decreasing fraction significantly enhances response isotherms change from Langmuir‐Henry Henry type. Finally, cross‐linked robust enough patterned photolithography. this demonstrates fabrication application monolithic sensor arrays. Different features responses analytes as input data linear discriminant analyses (LDA), revealing that very similar distinguished.