9h2 Synthesis

Materials All the chemicals used for synthesis purposes were of AR grade, purchased from Sigma Aldrich chemicals, and for spectral analysis spectral grade solvents were used. Double distilled water was used for preparing solutions. The test strains, Escherichia coli (E. coli) gram-negative, Staphylococcus aureus (S. aureus) gram-positive bacteria and Pseudomonas aeruginosa (P. aeruginosa) were purchased from IMTECH, Chandigarh, India. Yeast extract, tryptophan and bacterial-grade agar–agar were purchased from Hi-media Laboratories, Mumbai, India.
Synthesis of 2-[(4-methoxy-phenyl)iminomethyl]-4-nitrophenol (SB)
The Schiff-base, 2-[(4-methoxy-phenyl)iminomethyl]-4-nitrophenol, (C14H12N2O4) was synthesized by using p-Anisidine in methanol

In a separate beaker, 10-3 M of synthesized SB was dissolved in 10 ml DMF. The two solutions were mixed together under stirring and resulting yellow precipitate solution was transferred to a sonochemical bath. After 60 minutes of sonochemical treatment, the resulting CdS precipitate was collected, filtered, washed with double distilled water and absolute ethanol several times to remove the unreacted chemicals, and finally dried in an oven at 80oC for 5hours. Similar procedure was adopted to synthesize uncapped CdS

Elemental mapping over the selected regions of the CdS NPs was conducted by Energy-dispersive X-ray spectroscopy (EDX). The UV–visible diffuse reflectance spectra (UV-vis DRS) were obtained on the spectrophotometer of Shimadzu UV-3600 equipped with an integrating sphere accessory (BaSO4 was used as a reference). Fluorescence spectra were recorded on a Shimadzu RF-5301PC spectrofluorometer. The FT-IR spectra were recorded on a Shimadzu spectrophotometer. The powder X-ray diffraction (XRD) analysis was made with an X’pert Pro diffractometer. Zeta potential measurements were determined with the Zeta sizer Nano Z (Malvern,