Green production of self-assembled silver nanoarrays on flexible substrate for direct detection and catalytic degradation of organic water pollutants
Krithikadevi Ramachandran, Kais Daoudi, Soumya Columbus, Siva Chidambaram, Mounir Gaidi
Abstract
Facile eco-friendly green chemistry assisted (hybrid tea rose petals extract) self- assembled plasmonic silver nano structure arrays (AgNS) were fabricated on a flexible substrate. In-situ self-assembly during the reduction process lead to organize arrays like AgNS with smaller size Ag nanocubes. Synthetic mechanisms detailed with optimizations were deliberately projected with UV–visible absorption spectroscopic studies. Structural studies indicated the cubic system of silver with an average crystalline size of 20 nm. Electron microscopic images elucidate the array like self-assembled Ag cubes; outstand for high phase purity with 95.6% of Ag. As well, UV–vis absorption results confirmed the shape confinement of self-assembled Ag nanocubes with the SPR band located around 450–490 nm. Feasibility of AgNS array in catalytic degradation of Rhodamine B dye tests was assessed with efficient degradation of 97% within 8 min. Ever since AgNS were forthright in field of calorimetry detection, H2O2 calorimetry studies were portrayed. Further on, fabrication of flexible, cost-effective plastic SERS support as sensor was developed with AgNS array (GAFPS) is yet another milestone achieved in SERS sensor platform. Raman probe molecule (Rhodamine 6G (R6G)) was exploited in optimization experiments for SERS detection. The optimized GAFPS SERS sensor involved in detection of Methylene blue (MB) and Rhodamine B (RhB) dyes; Sensor sensitivity studies succeeded with its sensitivity limit down to nano-molar range for RhB whereas close to pico-molar range for MB. In nutshell, multifaceted features of self-assembled plasmonic AgNS brings in state of art in the detection and degradation of industrial waste water management systems.