A Chemical Route To Increase Hot Spots on Silver Nanowires for Surface-Enhanced Raman Spectroscopy Application

Goh, Madeline Shuhua; Lee, Yih Hong; Pedireddy, Srikanth; Phang, In Yee; Tjiu, Weng Weei; Tan, Joel Min Rui; Ling, Xing Yi

doi:10.1021/la302795r

Cited by 93 publications

(98 citation statements)

References 76 publications

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“…Surface Enhanced Raman Scattering (SERS) [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] and` Metal Enhanced Fluorescence (MEF) [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] both exploit the electric field enhancement associated with a plasmon resonance to substantially increase the spectroscopic signal. Despite the mechanistic similarities between SERS and MEF, there are few reports of SERS and MEF on the same structures.…”

Section: Introductionmentioning

confidence: 99%

A comparison of SERS and MEF of rhodamine 6G on a gold substrate

Kohr

Karawdeniya

Dwyer

et al. 2017

Phys. Chem. Chem. Phys.

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Rhodamine 6G is spin-cast onto gold surfaces and the reflectance, emission, excitation, and SERS spectra are reported. Electron microscopy shows that the particle sizes of the gold are uniform for all preparations. Reflection spectra show that the Rh6G aggregates for thicker films and that the gold plasmon band shifts due to the refractive index change on the surface. The intensity of the SERS spectra increases with increasing surface coverage but the rate of change modulates between submonolayer and multilayer surface densities. The emission spectra behave unexpectedly as a function of Rh6G coverage. At submonolayer coverage the emission is relatively strong, decreases as the surface density increases to a monolayer, and then increases as the Rh6G thickness increases. Excitation spectra demonstrate that the emitting species at low surface density is monomeric but for thicker layers the excited state responsible for emission is Rh6G aggregates. For the thicker films, the Rh6G acts as its own dielectric layer for metal enhanced fluorescence of the aggregates.iii ACKNOWLEDGMENTS

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Section: Introductionmentioning

confidence: 99%

A comparison of SERS and MEF of rhodamine 6G on a gold substrate

Kohr

Karawdeniya

Dwyer

et al. 2017

Phys. Chem. Chem. Phys.

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“…研究表明, 等离子纳米材料的表面粗糙度的增加通常会导致其品质因子 (Q-factor)的降低, 进而通过欧姆损耗(Ohmic losses)降低材料的拉曼散射性能 [31] . 结晶度的保留说明刻蚀后波纹状银纳米线的品质因子并没有降低, 这就确保了波纹状银纳米线的拉曼散射性能并没有因为刻蚀而降低 [24] . …”

Section: 近年来由于表面增强拉曼光谱(Surface-enhancedunclassified

“…图 3b 显示的是波纹状银纳米线的 SPR 吸收峰, 此时只有一个较宽的吸收峰出现, 其吸收波长大概在 386 nm 处. 与光滑的银纳米线相比, 波纹状银纳米线的吸收峰发生了轻微的蓝移, 即吸收波长从 392 nm 蓝移至 386 nm 处, 这是因为刻蚀后银纳米线直径变小的缘故, 而吸收峰的变宽则可能是由于银纳米线表面粗糙度增加所致 [24] . [35,36] .…”

Section: 刻蚀前后银纳米线的紫外-可见吸收光谱分析unclassified

“…与光滑的银纳米线相比, 波纹状银纳米线作基底时的拉曼光谱强度提高了约 5 倍. 这是由于这种带有波纹状表面的银纳米线在其长轴表面上也具有很高的 SERS 活性, 而不再局限于纳米线的两端, 同时, 波纹状银纳米线与线交叉部位的光耦合作用比光滑的纳米线要强, 导致其总体 SERS 效果明显增强 [22,24] . 另外, 由于刻蚀作用导致的波纹状银纳米线表面积的增加也会在一定程度上造成分子信号的增加.…”

Section: 刻蚀前后银纳米线的紫外-可见吸收光谱分析unclassified

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Fabrication of Silver Nanowires with Corrugated-Surface and Its SERS Performance

Chen¹,

Aiwu²,

Gao³

et al. 2014

Acta Chim. Sinica

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In order to create the effective number of surface-enhanced Raman scattering (SERS) active "hot spots" on the one-dimensional nanostructure surfaces for ensuring the maximum enhancement of SERS signal, smooth silver nanowires (Ag NWs) were firstly synthesized by the conventional polyol method, and then the smooth silver nanowires were subjected to chemical etching by the Fe(NO 3 ) 3 aqueous solution at room temperature to obtain corrugated silver nanowires. This corrugated silver nanowires were systematically characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) microscopy, Ultraviolet-visible (UV-vis) extinction spectroscopy and surface enhanced Raman spectroscopy (SERS). The SEM image of smooth silver nanowires shows that had a diameter of ca. 120 nm and lengths of about tens of micrometers, while the average thickness of corrugated nanowires was only about 100 nm. The XRD patterns for both smooth and corrugated silver nanowires indicate that the fcc structure was preserved after chemical etching. From the measurement of UV-vis spectra we can see that after the smooth silver nanowires were subjected to chemical etching, only one broad surface plasmon peak was observed at ca. 386 nm while two significant peaks were observed at 353 and 392 nm for the smooth silver nanowires. The slight blue-shift of this peak from 392 to 386 nm could be contributed by the decrease in diameter of silver nanowires, whereas the broadening of the plasmon peak was probably a result of increased surface roughness. The SEM images showed that the surface roughness of silver nanowires was dependent on the amount of Fe(NO 3 ) 3 , by increasing the amount of Fe(NO 3 ) 3 added into the silver nanowires solution, the surface of silver nanowires become more and more rough. However, as the excess amount of etchant added, most silver nanowires would broke off into shorter rods, and even spherical particles. Raman analyses of crystal violet (CV) indicated that the SERS intensity changes depending on the surface roughness of etched silver nanowires, and the silver nanowires with corrugated surfaces exhibited higher enhancement of SERS signal than the smooth silver nanowires. In addition, the SERS detection of CV and 4-mercaptopyridine (4-Mpy) molecules exhibited high detection sensitivity and the detection concentration were as low as 10 -10 and 10 -9 mol/L, respectively, which means that the corrugated silver nanowires could be an efficient SERS active substrate.

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“…Various nanoparticles and structures are being introduced and studied for this aim. 33,34 Other studies, on the other hand, show results of second harmonic generation (SHG) response from plasmonic nanoshell structures 35 and its dependence on the core dielectric constant as well as on the refractive index of the surrounding medium. Despite the fact that the main interest with plasmonic nanostructures is more concentrated on cancer therapy and diagnosis, these particles have had a significant influence on other fields of science as well.…”

Section: Introductionmentioning

confidence: 99%

Barium titanate core – gold shell nanoparticles for hyperthermia treatments

FarrokhTakin¹,

Ciofani²,

Puleo³

et al. 2013

IJN

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Abstract:The development of new tools and devices to aid in treating cancer is a hot topic in biomedical research. The practice of using heat (hyperthermia) to treat cancerous lesions has a long history dating back to ancient Greece. With deeper knowledge of the factors that cause cancer and the transmissive window of cells and tissues in the near-infrared region of the electromagnetic spectrum, hyperthermia applications have been able to incorporate the use of lasers. Photothermal therapy has been introduced as a selective and noninvasive treatment for cancer, in which exogenous photothermal agents are exploited to achieve the selective destruction of cancer cells. In this manuscript, we propose applications of barium titanate core-gold shell nanoparticles for hyperthermia treatment against cancer cells. We explored the effect of increasing concentrations of these nanoshells (0-100 µg/mL) on human neuroblastoma SH-SY5Y cells, testing the internalization and intrinsic toxicity and validating the hyperthermic functionality of the particles through near infrared (NIR) laser-induced thermoablation experiments. No significant changes were observed in cell viability up to nanoparticle concentrations of 50 µg/mL. Experiments upon stimulation with an NIR laser revealed the ability of the nanoshells to destroy human neuroblastoma cells. On the basis of these findings, barium titanate core-gold shell nanoparticles resulted in being suitable for hyperthermia treatment, and our results represent a promising first step for subsequent investigations on their applicability in clinical practice.

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A Chemical Route To Increase Hot Spots on Silver Nanowires for Surface-Enhanced Raman Spectroscopy Application

Cited by 93 publications

References 76 publications

A comparison of SERS and MEF of rhodamine 6G on a gold substrate

A comparison of SERS and MEF of rhodamine 6G on a gold substrate

Fabrication of Silver Nanowires with Corrugated-Surface and Its SERS Performance

Barium titanate core – gold shell nanoparticles for hyperthermia treatments

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A Chemical Route To Increase Hot Spots on Silver Nanowires for Surface-Enhanced Raman Spectroscopy Application

Cited by 93 publications

References 76 publications

A comparison of SERS and MEF of rhodamine 6G on a gold substrate

A comparison of SERS and MEF of rhodamine 6G on a gold substrate

Fabrication of Silver Nanowires with Corrugated-Surface and Its SERS Performance

Barium titanate core &ndash; gold shell nanoparticles for hyperthermia treatments

Contact Info

Product

Resources

About

Barium titanate core – gold shell nanoparticles for hyperthermia treatments