Robust gold nanoparticles stabilized by trithiol for application in chemiresistive sensors

Abstract

The use of gold nanoparticles coated with an organic monolayer of thiol for application in chemiresistive sensors was initiated in the late 1990s; since then, such types of sensors have been widely pursued due to their high sensitivities and reversible responses to volatile organic compounds (VOCs). However, a major issue for chemical sensors based on thiol-capped gold nanoparticles is their poor long-term stability as a result of slow degradation of the monothiol-to-gold bonds. We have devised a strategy to overcome this limitation by synthesizing a more robust system using Au nanoparticles capped by trithiol ligands. Compared to its monothiol counterpart, the new system is significantly more stable and also shows improved sensitivity towards different types of polar or non-polar VOCs. Thus, the trithiol-Au nanosensor shows great promise for use in real world applications.

Chemiresistive Sensing with Chemically Modified Metal and Alloy Nanoparticles

“…Garg et al prepared trithiol‐capped Au MPCs and deposited them by inkjet‐printing on a spiral Au IDA of electrodes for chemiresistive sensing of various analytes including Tol, EtOH, dichloroethane, MeOH, and acetone 32. They compared stability of the trithiol‐protected Au MPC films with the conventional monothiol C8S Au MPCs.…”

Synthesis and characterization of tin dioxide thick film modified by APTES in vapor and liquid phases

“…Surface functionalization is being used in wide range of applications, like surface and selfassembling monolayers (SAMs) in bio-sensors [1,2], gas sensors [3][4][5], corrosion resistance of metal [6] and electronics [7]. Generally, surfaces are organically modified to enhance detection performance, surface rigidity, selectivity and sensitivity of sensors, etc.…”

Di-(2-ethylhexyl) dithiophosphoric acid surface protected gold nanoparticles: micellar synthesis, stabilization, isolation, and properties

“…The problem of the conservation of the initial size of nanoparticles during the isolation process is a very urgent task, so the isolation of the particles is performed in the presence of a protective agent preventing their agglomeration. Different types of protective reagents for gold nanoparticles are known, in particular citrate ion [6,7], alkylthiols [22][23][24], alkylthioacetates [25], organic amines [26,27], and phosphines [28].…”