Synthesis of centimeter level AgCu alloy nanowires via a solid-state ionics method and their SERS effect

An Efficient Strategy to Prepare Ultra-High Sensitivity SERS-Active Substrate Based on Laser-Induced Selective Metallization of Polymers

“…To better understand the minimum concentration of R6G that can be tracked using our prepared SERS-active substrate, the lower detection limits of R6G reported using other copper-based SERS substrates are listed and compared in Table S1 of the Supporting Information. It is worth mentioning that, in this work, the minimum detection limit reached by the prepared SERS-active substrate is far superior to those reports in most literature. − Thus, the SERS-active substrate designed by us has an outstanding sensitivity. The commonly used analytical enhancement factors (AEF) are calculated for the SERS-1 substrate, and the specific calculation process is provided in the Supporting Information.…”

“…For 1 × 10 –5 M, 1 × 10 –11 M, and 1 × 10 –17 M R6G solutions, the AEF of the SERS-1 substrate are 1.97 × 10 3 , 4.97 × 10 8 , and 7.24 × 10 13 , respectively. Compared with other literature, − the prepared SERS-1 substrate has very high enhancement factors, especially at low concentrations. In addition, our experiments further confirm that the SERS-1 substrate can realize a quantitative detection when the concentrations of R6G are ranged from 1 × 10 –12 M to 1 × 10 –3 M (as illustrated in Figure S6).…”

“…However, Raman characteristic peaks of the R6G dye molecule are observed on SERS-0.2, SERS-0.5, SERS-1, SERS-2, and SERS-3 substrates. According to the literature, [1][2][3][4][5][6][7][8][9][10][11][12][13][14]38 the bands of 1183, 1363, 1510, 1571, and 1650 cm −1 are the C-C stretching vibration of aromatic benzene rings; moreover, the peaks of 613 and 771 cm −1 are assigned to the C-H in-plane and out-of-plane bending vibration in the xanthene skeleton. As shown in Figure 5a, the R6G is detected on SERS-0.2 and SERS-0.5, but Raman peaks' intensities are much weaker, and the maximum Raman spectral intensity of R6G is obtained on SERS-1.…”

“…Over the past few decades, the surface-enhanced Raman spectroscopy (SERS) possesses many advantages, such as fast, convenient, nondestructive testing, and low water interference, which has become an important and powerful analytical technique in various fields, including microanalytical applications, catalysis, electrochemistry, and environmental science. − There are two universally accepted mechanisms regarding the enhancement effects of SERS, defined as the electromagnetic (EM) enhancement and the chemical (CHEM) mechanism. ,,,,, The EM enhancement is related to the localized surface plasmon resonances (SPRs) excited by the incident light on the surface of rough metal substrates, and inelastic light scattering absorbed by noble metal nanoparticles is greatly enhanced. On the contrary, the CHEM mechanism is mainly attributed to the electron transfer between the molecules to be tested and the SERS-active matrix, the so-called charge-transfer mechanism.…”

Growth mechanism and photoelectric properties of a silver nanowire network prepared by solid state ionics method

“…As a comparison, continuous, macroscopically long, and large-area pure metal nanostructure can be prepared by the solid state ionics method in the absence of templates and subsequent purifying processes, thus making the solid state ionics method a widely employed approach to prepare various metal nanostructures [10][11][12][14][15][16][17][18]. However, at present, the microscopic mechanism of the solid state ionics method is yet to be established to fully harness the potential of such a process.…”