The synthesis of Ag-coated tetrapod gold nanostars and the improvement of surface-enhanced Raman scattering

Eliminating irreproducibility in SERS substrates

“…(a) Comparison between RSDs from various SERS substrates as reported in literature or presented in this work. Values are collated from the following literature: 3 , [ 31 ] 5 , [ 32 ] 7 , [ 33 ] 8 , [ 34 ] 9 , [ 35 ] 10 , [ 36 ] 11 , [ 37 ] 12 , [ 38 ] 13 , [ 39 ] 14 , [ 40 ] 16 , [ 41 ] 17 , [ 42 ] 18 , [ 43 ] 19 , [ 44 ] 20 , [ 30 ] 21 , [ 32 ] 22 , [ 28 ] 23 , [ 45 ] 24 , [ 46 ] 25 , [ 47 ] 26 , [ 48 ] 27 [ 49 ] , 28 , [ 50 ] 29 , [ 51 ] 30 , [ 52 ] 31 , [ 53 ] 32 , [ 54 ] 33 , [ 55 ] 34 , [ 56 ] 35 , [ 57 ] 36 , [ 58 ] 37 , [ 32 ] 38 , [ 59 ] 39 , [ 29 ] 40 , [ 29 ] 41 , [ 60 ] 42 , [ 61 ] 43 , [ 62 ] 44 , [ 63 ] 45 , [ 64 ] 46 , [ 65 ] 48 , [ 55 ] 49 . [ 33 ] (b) SERS signal for CB[5,7] aggregates for different CB concentrations.…”

Silver Nanoparticles for Water Pollution Monitoring and Treatments: Ecosafety Challenge and Cellulose-Based Hybrids Solution

“…By choosing the appropriate method and experimental parameters for the synthesis it is possible to control shapes and obtain spheres (AgNPhs), cubes (AgNCs), stars (AgNSs) and rods (AgNRs) [ 72 , 73 , 74 , 75 , 76 , 77 , 78 , 79 , 80 , 81 , 82 , 83 , 84 , 85 , 86 , 87 , 88 , 89 , 90 , 91 , 92 , 93 , 94 , 95 , 96 , 97 , 98 , 99 , 100 ]. Some examples with TEM images showing AgNPs with different geometries and shapes are presented in Figure 1 [ 68 , 81 , 88 ].…”

“…The large extinction background can be attributed to the absorption and scattering emissions produced by the different morphologies of all the existing NPs, integrated by AgNSs bearing different numbers of arms and having different tip sharpness. The mixture of all these factors leads to very different LSPR in the suspension, since a wide range of wavelengths in the visible and near-IR ranges can be covered with various AgNSs shapes and dimensions [86][87][88][89][90][91][92][93].…”

Designing Silver Nanoparticles for Detecting Levodopa (3,4-Dihydroxyphenylalanine, L-Dopa) Using Surface-Enhanced Raman Scattering (SERS)

“…This also means that the orientation of ATZ molecules on AgNP is crucial for this ultrasensitive analysis. One may infer that signal enhancement for analytes can be obtained by tailoring the size and shape of the nanoparticles [12][13][14], in addition to the conformation of the analyte adsorbed as in the detection of B-complex vitamins in pharmaceutical samples [15].Such control in nanoparticle shape is afforded through various synthetic routes [16][17][18], then allowing the Localized Surface Plasmon Resonances (LSPR) to be tuned according to the region of best response (excitation) of the analyte [14,18,19]. For example, the near electromagnetic field is higher in nanoprisms (AgNPR), nanostars (AgNS) and nanorods (AgNR) than on spherical nanoparticles (AgNP) [18,19], and the LSPR may be wider to allow excitation down to the near infrared (IR) [18][19][20].…”

“…Such control in nanoparticle shape is afforded through various synthetic routes [16][17][18], then allowing the Localized Surface Plasmon Resonances (LSPR) to be tuned according to the region of best response (excitation) of the analyte [14,18,19]. For example, the near electromagnetic field is higher in nanoprisms (AgNPR), nanostars (AgNS) and nanorods (AgNR) than on spherical nanoparticles (AgNP) [18,19], and the LSPR may be wider to allow excitation down to the near infrared (IR) [18][19][20].…”