Sunlight and ultrasound-assisted synthesis of photoluminescent silver nanoclusters: A unique ‘Knock out’ sensor for thiophilic metal ions

Synthesis of Dual Red‐Emitting Fluorescent Silver Nanoclusters in Aqueous Lipoic Acid‐Based Polymer Solutions and Application for Cu2+ Detection and Cell Imaging

“…The size distribution curve (Inset of Figure 3A) shows a good fit with normal distribution and the Ag nanoclusters with the diameter sizes ranging from 1.30 nm to 2.45 nm are counted for 74 %. HR‐TEM image (Figure 3B) well displays that PVA‐LA‐protected AgNCs are spherical particles and the presence of the lattice plane with an interfinger distance of 0.21 nm corresponding to the (111) diffraction plane of the face‐centered cubic Ag can be observed [25] . At the same time, valence state of Ag is determined by XPS, as shown in Figure 3C.…”

“…HR-TEM image (Figure 3B) well displays that PVA-LAprotected AgNCs are spherical particles and the presence of the lattice plane with an interfinger distance of 0.21 nm corresponding to the (111) diffraction plane of the facecentered cubic Ag can be observed. [25] At the same time, valence state of Ag is determined by XPS, as shown in Figure 3C. Binding energies of 368.2 eV (Ag 3d5/2) and 374.2 eV (Ag 3d3/2) belong to Ag(0) and Ag(I), respectively, indicating that Ag ions are successfully reduced by NaBH 4 to form metallic Ag.…”

In Situ Formation of Ag Nanoparticles Capped by Photoactivable Ligands for Optical Sensing of Hypochlorite

“…Sunlight is mainly composed of ultraviolet (UV) light (λ<400 nm), visible light (400<λ<700 nm), and near‐infrared light (λ>700 nm). The effect of different light has been evaluated in terms of energy . The absorption spectra clearly indicates that UV light (λ=365 nm) induced the evolvement of SPR absorption at around 400 nm, instead of visible light such as red, green, and blue light (Figure b).…”

“…The explanation may be that, the cap layers were destroyed by ClO − induced oxidation of thiolate groups. SEM images clearly suggest that spherical AgNPs were replaced by the cube and cuboid crystals after interaction with ClO − (see Supporting Information, Figure s2) …”

Methionine-Capped Gold Nanoclusters as a Fluorescence-Enhanced Probe for Cadmium(II) Sensing

“…In 2016, Niu et al, developed a dumbbell-shaped CQDs/Au NCs nanohybrid as a ratiometric fluorescent sensor for Cd 2+ through a “turn-off” method [ 25 ]. In 2017, Naaz and Chowdhury synthesized a photoluminescent Ag NCs through fine tuning of sunlight and ultrasound to detect thiophilic metal ions (including Cd 2+ ion), which is also based on fluorescence quenching [ 26 ]. However, such “turn-off” modes inevitably produce false results, which is not preferable in practice because other quenchers or environmental stimulus may also cause fluorescence quenching, and thus affect the sensitivity and authenticity of the test [ 27 ].…”