Photoresponse of an off-stoichiometry thiol–ene–epoxy (OSTE⁺) polymer

Abstract

The development of off-stoichiometry thiol-ene-epoxy (OSTE+) based functional polymer has paramount importance for smart photonic sensors integrated lab-on-chip device applications. A modest attempt has been made to develop a semiconducting...

Self-Functional Off-Stoichiometry Polymeric Materials: Potential for Tunable Plasmonic Applications

“…This peak was distinctly exhibited at ∼284.87 eV and accompanied by another weak but noticeably resolved band at around 287.8 eV. These peaks originated from the C–CO and C–O groups, respectively. ,, The formation of carbon–oxygen bonds was attributed to the existence of methyl ester and ether groups within the thiol–ene–epoxy polymer chain. , This carbon–oxygen interaction was associated with the bonding of carbonyl groups and hybridized carbon atoms. ,, In addition, another spectrum of O 1s energy states was observed to be centered at ∼532.18 eV for the C–O bond with two deconvoluted peaks (Figure e). The presence of these two relatively weaker peaks at around 531.81 and 533.0 eV was attributed to carbonyl groups due to the presence of Au–O and CO bonds. ,, …”

“…However, they exhibited significant absorption below 350 nm (inset of Figure a). The observed optical absorption in the UV region was attributed to the presence of both alkane and alkylene functional groups within the linear hydrocarbon chain of the thiol–ene–epoxy polymer. , …”

“…61,66,67 The formation of carbon− oxygen bonds was attributed to the existence of methyl ester and ether groups within the thiol−ene−epoxy polymer chain. 50,60 This carbon−oxygen interaction was associated with the bonding of carbonyl groups and hybridized carbon atoms. 10,60,62 In addition, another spectrum of O 1s energy states was observed to be centered at ∼532.18 eV for the C−O bond with two deconvoluted peaks (Figure 6e).…”

“…The observed optical absorption in the UV region was attributed to the presence of both alkane and alkylene functional groups within the linear hydrocarbon chain of the thiol−ene−epoxy polymer. 50,59 We assumed that the −SH groups were evenly distributed all over the film. In this polymer, only the surface containing −SH groups represents the self-functional property that plays an important role in many biocompatible sensing applications.…”

“…The constituent monomers thiol, allyl, and epoxy, including two initiators DBN and BAPO, were used to prepare the variable thiol-excess OSTE+ monomer solution (Figure 1a). The experimental procedure for the development of the thiol-excess OSTE+ monomer solution has been described in our previous study, 50 and the sample names are provided in Table 1. By varying the weight percentage of thiol from 20 to 80%, different hydrophobicities of these solutions were observed (Figure 1b).…”