UV–Irradiation Induced Synthesis of Fluorescent Poly (Acrylic Acid) Stabilized Silver Clusters

Abstract

Abstract. Photochemical treatment using ultraviolet radiation was used to prepare fluorescent silver nanoparticles/nanoclusters from AgNO 3 precursor upon its encapsulation with Poly (Acrylic Acid). Spectrofluorometric analysis showed an excitation spectra with maxima at approximately 450 nm and 550 regions nm when fixed wavelength of 600 nm was used to scan the solutions. Fluorescent emission occurred at around 500 nm and 700 nm using the 450 nm excitation wavelength. High molecular weight polymer (AgPAA1250) showed higher intensity of emission than low molecular weight (AgPAA450). Stability of the nanoparticle solution was assessed using Zeta Potential Measurements. Despite having a larger average particle diameter, Zeta Potential value for AgPAA 1250 is more negative than AgPAA 450, -59.3 mV and -47.5 mV respectively. This tells us that using a polymer with larger molecular weight can better prevent the aggregation of the nanoparticles.

In Memoriam – Dr. Leon M. Payawan Jr.

“…He also served as a member of the thesis committee on 12 masteral and 5 doctoral candidates either as a reader or as an examiner. Through his supervision, his students have addressed some of the major challenges in materials science research, specifically in understanding the properties of various materials such as the metal oxides TiO2 (Usman et al, 2017;Buenviaje et al, 2020;Panghulan et al, 2020), Fe3O4 (Gorospe et al, 2019), ZnO (Magdaluyo et al, 2007), and SiO2 (Edañol et al, 2018), colloidal silver (Usman et al, 2015;Usman et al, 2014), zeolites (Trinidad et al, 2016;Trinidad et al, 2017), metal-organic frameworks (Usman et al, 2018;Usman et al, 2020), and layered double hydroxides (Edañol et al, 2020) along with their respective development towards a wide array of applications such as energy conversion, sensing, bioremediation, and drug delivery.…”