## 1 Introduction
(2013) fabricated a composite of a TSNPs and chitosan, which significantly enhanced the sensitivity as a surface plasmon resonance (SPR) biosensor [25]. Dithiocarbamate-stabilized TSNP were used to obtain nanocomposites with polythiophene-derived nanoparticles, in order to obtain a stable system that could be used for applications in catalysis, biosensing, electronics, and optics [26]. The synthesis of solid silver/polyvinylpyrrolidone/polyacrylonitrile nanocomposite films with triangular silver nanoprisms was also reported, taking advantage of their optical absorption spectra to increase the efficiency of photothermal conversion in the polymer matrix, expecting this material to be used in applications such as absorbing materials for solar collectors [27]. [PERSON] et al. (2019) compared the antimicrobial activity of TSNPs with different polymeric coatings (such as silica, PVP, or mercaptohexadecanoic acid), and found that the surface charge of the selected polymeric coating has an effect on the antimicrobial efficacy of TSNPs towards Gram-positive or Gram-negative strains [28]. Similarly, [PERSON] et al. (2019) studied the feasibility of a gelatin-chitosan coating on the synthesis of TSNPs and evaluated their antimicrobial activity, which was higher than other AgNP morphologies [29]. A chemical method for synthesis of TSNPs and posterior ex situ incorporation into polyvinyl alcohol (PVA) was also reported. Potential applications of this method include dichroic materials and antimicrobial materials, but the antibacterial effects were not evaluated during this study [30]. As the applications for TSNPs can be diverse, their incorporation into polymers for purposes such as improvement of electrical conductivity, thermal conductivity, and biosensing were explored, but there is still a lack of research about their integration into plastics for antimicrobial purposes. With regard to application in diagnostics, noble metal nanoparticles such as Ag and Au particles exhibit localized surface plasmon resonance (LSPR) in the visible region of the electromagnetic spectrum, making them attractive for sensing applications, as changes can even be detected with the naked eye in some cases, making detection faster, easier, and inexpensive [31]. LSPR is an optical phenomenon that uses the sensitivity of these plasmons' frequency to change the local refractive index at the nanoparticle surface, emerging as a highly sensitive label-free biosensing technique [31]. This presents the LSPR technique as a powerful tool for optical biosensing applications in a range of areas, including biology, biochemistry, and medical sciences, with the potential to be used as portable devices for diagnosis and easy-to-use point-of-care (POC) device platforms [32; 33]. In biosensing applications, the nanoparticles' LSPR is used to detect changes in the position of the LSPR bands where the position depends on the nanoparticles' shape, size, uniformity, composition, dielectric environment, local refractive index, and separation distance of NPs [34; 35; 36; 37]. To date, several silver nanostructures with high refractive index sensitivities were reported, such as nanorice, nanobipyramids, nanorings, triangular silver nanoplates (TSNPs), and edge gold-coated silver nanoprisms [38]. Among these diverse nanostructures, TSNPs exhibit attractive tunable plasmonic properties due to their sharp corners, and their optical profile displays the strongest and sharpest peaks among all metals [36]. AgNPs are particularly attractive because among all metals, silver possesses the greater scattering cross-section, which means a higher probability of interaction between radiation and the target [39]. Consequently, AgNPs show the most intense plasmonic interaction with incident light, compared to other metallic NPs [40]. Due to their properties, AgNPs are recognized as efficient optical sensors for pesticide residues detection [41].