Selective colorimetric sensing of histidine in aqueous media via Ag nanotriangles in the presence of HgCl.

Silver nanotriangles (AgNTs) were successfully synthesized as a colorimetric probe for selective and sensitive histidine detection in aqueous media within a 15-100 µM range and a detection limit of 330 nM using UV-Vis spectroscopy. The interaction of HgCl with AgNTs would lead to the formation of disk-shaped Ag/Hg amalgam as observed from the transmission electron images and X-ray diffraction patterns. Histidine prevents these structural and morphological changes and accordingly, the detection approach was developed based on the correlation between the histidine concentration and the in-plane dipole plasmon resonance (DPR) intensity.

Enhanced Photocatalytic Properties of Restacked Unilamellar [SrTaO] Nanosheets of Aurivillius Phase Layered Perovskites.

In the present work, unilamellar [SrTaO] perovskite nanosheets with variable lateral dimensions were synthesized via a high-yield, three-step liquid exfoliation route from layered BiSrTaO. The photocatalytic activity of the parent and exfoliated layered perovskites was evaluated for the photocatalytic dye degradation of Rhodamine B under UV light (254 nm) and reduction of water to H under the full solar spectrum. A comparative study of the photocatalytic behavior of unilamellar [SrTaO] perovskite nanosheets and parent layered structure showed a significant improvement in both hydrogen evolution (98.

Facile and on-line colorimetric detection of Hgbased on localized surface plasmon resonance (LSPR) of Ag nanotriangles.

A rapid and sensitive colorimetric detection method for the determination of Hg has been successfully developed in this research. Citrate-functionalized silver nanotriangles (AgTrngs) were synthesized via one-pot sodium borohydride method with the edge-length range of 30 - 40 nm. The obtained AgTrngs were fully characterized using UV-Vis spectrophotometry, transmission electron microscopy (TEM), energy dispersed spectroscopy (EDS) and X-ray diffractometer.

Modified Finke-Watzky mechanisms for the two-step nucleation and growth of silver nanoparticles.

In this work, a new modification was made on the Finke-Watzky mechanism for investigating the nucleation and growth steps in the synthesis of silver nanoparticles (AgNPs). UV-vis spectrophotometry and transmission electron microscopy evaluations proved that the former linear form of Finke-Watzky mechanism is not efficient for describing the nucleation and growth steps of AgNPs synthesis. In this manner, the Finke-Watzky mechanism was modified by considering a reversible pseudo first-order reaction for nucleation step.