Synthesis of β-cyclodextrin functionalized gold nanoparticles for the selective detection of Pb2+ ions from aqueous solution

Precision Target Guide Strategy for Applying SERS into Environmental Monitoring

“…These interactions all have been successfully applied into promoting the selectivity of SERS-based method into specific target monitoring [28][29][30][31]. Host-guest interaction is an important phenomenon in supramolecular chemistry, which describes the special interaction between the host molecules with unique structure and the guest smaller molecules or ions.…”

“…As shown in Figure 1, the cavity diameter is 6.4 À, which contributes to the interaction with guest molecules [39]. As a functional modifier, β-CD has been used for the SERS detection of both organic pollutants and inorganic ions, such as polychlorinated biphenyls (PCB-77, PCB-1) down to 3 μM, [40] methyl parathion at picomolar level, [41] PAHs (anthracene, pyrene or anthrecene) [39,42] and micromolar Pb 2+ ions [29]. In most of the reported works, thio-modified β-CD (such as per-6-deoxy-(6-thio)-β-CD) was used because of the weak modifying efficiency of natural β-CD onto the surface of the metal structure.…”

Trace colorimetric detection of Pb 2+ using plasmonic gold nanoparticles and silica–gold nanocomposites

“…Table 1 represents the comparison of the limits of detection of various methods that have been developed involving nanomaterials as the nanoprobes [54][55][56][57][58][59][60][61]. The proposed method using SiO 2 @Au NCs shows high selectivity and sensitivity for the necked eye detection upto 50 nM…”

“…surface of the AuNPs must first be functionalized with biomolecules or small receptors without altering the stability of the functional groups in solution [30][31][32]. Therefore, continued strategies have been to develop metal ion sensors for specific metals based on synthesis of nanomaterials.…”

“…These are usually based on the localized surface plasmon resonance (LSPR) for the modified Au and even AgNPs [3,[6][7][8][9]24,[29][30][31][32]. Among various optical reporting methodologies listed in the literature for the detection of Pb 2+ ions, sensing based on the plasmon absorption of Au and…”