Gold nanoparticle assisted synthesis and characterization of As–S crystallites: Scanning electron microscopy, X-ray diffraction, energy-dispersive X-ray and Raman spectroscopy combined with DFT calculations

Photoinduced transformations in (As1–xBix)2S3 glass observed by Raman spectroscopy

“…46,47 Additional contribution to the increasing maximа slightly above 180 cm À1 and near 230 cm À1 may also come from the formation of As 4 S 5 structural groups considered in detail in a recent study. 60 As can be seen from Figure 5, the drastic increase of the maxima near 180 and 230 cm À1 at P exc = 40 kW/cm 2 is accompanied by total vanishing of the feature near 290 cm À1 in the spectra of the (As 1-x Bi x ) 2 S 3 glasses related most likely, as noted above, to the vibrations of structural units with As, Bi and S atoms. Note that the drastic changes in the Raman spectra are observed from the very first seconds of the measurement.…”

“…Another possible explanation of the appearance of intense Raman features near 180 and 230 cm −1 at the increased P exc can be related to the above mentioned transformation of As 4 S 4 clusters in the glass from realgar to pararealgar structure 46,47 . Additional contribution to the increasing maximа slightly above 180 cm −1 and near 230 cm −1 may also come from the formation of As 4 S 5 structural groups considered in detail in a recent study 60 …”

Red gum-capped gold nanoparticles for electrochemical sensing of bromocresol purple in water

“…18–23 For example, AuNPs are used as electrochemical probes for the detection of many analytes such as cortisol, 24 diethylstilbestrol, 25 dopamine, 26 norepinephrine, 27 serotonin, 28 boron, 29 copper( ii ) ions, 30 arsenic ions, 31 phosphates, 32 and Escherichia coli . 33 AuNPs can be fabricated by different methods such as laser-induced photochemical synthesis, 34 plasma-based instant synthesis, 35 UV-induced decomposition, 36 chemical vapor deposition, 37 and chemical reduction. 38 Chemical reduction is considered the most widely used method for the synthesis of AuNPs.…”