Green-nanochemistry for safe environment: bio-friendly synthesis of fluorescent monometallic (Ag and Au) and bimetallic (Ag/Au alloy) nanoparticles having pesticide sensing activity

Abstract

Aqueous methanol (water:methanol 20:80) extract of leaves (AMEL) of Indian curry leaf plant was found to be highly efficient in the rapid and controlled synthesis of stable and fluorescent monometallic (Ag and Au) and also bimetallic (Ag/Au alloy) nanoparticles with wide spectrum of task specific morphologies under sonochemical condition. The nanoparticles synthesized by the present economically viable and environment-friendly protocol showed characteristic fluorescence activity. This was exploited in the fluorometric sensing of the dithiocarbamate pesticide, Mancozeb in aqueous medium. The surface chemistry of these nanoparticles was extensively studied to understand their sensing activity. The naturally occurring flurophoric/chromophoric compounds (carbazole alkaloids and polyhydroxy flavonoid) present in AMEL instilled (in situ) strong and characteristic fluorescent behavior to the synthesized nanoparticles which opened up their utility as the fluorometric sensors and detectors for pesticides in aqueous medium.

Mangifera indica Mediated Synthesis of Silver Nanoparticles as An Efficient Electrochemical Sensor for The Detection of Ascorbic Acid

“…The presence of four lattice planes viz, (111), (200), (220), and (311) confirmed the formation of face-centered cubic (FCC) crystal structure of silver nanoparticles, and these lattice planes were associated with the diffraction peaks at ca 38.08°, 44.04°, 64.49° and 77.34°. These results confirmed the formation of metallic silver (JCPDS 04-0783) [19]. Fig.…”

Interrogating the Electrochemical Potential of Senna obtusifolia Mediated Biosynthesized Silver Nanoparticles

“…The presence of four lattice planes viz, (111), (200), (220), and (311) confirmed the formation of face-centered cubic (FCC) crystal structure of silver nanoparticles, and these lattice planes were associated with the diffraction peaks at ca 38.08°, 44.04°, 64.49° and 77.34°. These results confirmed the formation of metallic silver, (JCPDS 04-0783) [17].…”

Exploring the Propensities of Fluorescent Carbazole Analogs toward the Inhibition of Amyloid Aggregation in Type 2 Diabetes: An Experimental and Theoretical Endeavor

“…Cz5 was previously isolated in our lab from the methanol extract of leaves of M. koenigii Spreng. 40 All tissue culture materials were obtained from Gibco-BRL/Life Technologies. Thiobarbituric acid (TBA) was purchased from Sigma-Aldrich (St. Louis, MO, USA), except for primary antibodies, which were purchased from Santa Cruz Biotechnology, India.…”

“…The method of synthesis of Cz4 and its characterization data are given in the Supporting Information, pages S3–S4 and S25–S27, respectively. Cz5 was previously isolated in our lab from the methanol extract of leaves of M. koenigii Spreng . All tissue culture materials were obtained from Gibco-BRL/Life Technologies.…”