Fabrication, Characterization, and Application in SERS of Self-Assembled Polyelectrolyte−Gold Nanorod Multilayered Films

Hu, Xiaoge; Cheng, Wenlong; Wang, Tie; Wang, Yuling; Wang, Erkang; Dong, Shaojun

doi:10.1021/jp052706r

Cited by 144 publications

(155 citation statements)

References 56 publications

Supporting

Mentioning

147

Contrasting

Order By: Relevance

“…Clearly, the AgNS/AuNP/NH2-cBN/Si(001) substrate showed higher stability than the silver film/cBN/Si(001) substrate prepared by the mirror reaction, which could be ascribed to the uniformity of the AgNS film and to the strong adhesion of the AgNS with the substrate. Moreover, compared with previous reports on other substrates, such as porous Au/Ag nanostructured-modified silica films, Au nanorod-modified indium-doped tin oxide films, and µAg powders/polymers, [25][26][27] the higher stability obtained in present AgNS/AuNP/ NH2-cBN/Si(001) can be mainly attributed to the extremely high physical and chemical stability of the cBN substrate. …”

Section: Detection Of Patp By the Sers Spectra On The Agns/aunp/nh2-csupporting

confidence: 38%

Surface-Enhanced Raman Scattering of 4-Aminothiophenol Adsorbed on Silver Nanosheets Deposited onto Cubic Boron Nitride Films

et al. 2010

View full text Add to dashboard Cite

A simple method was found for the fabrication of silver nanosheets (AgNS) by the catalysis of gold nanoparticles (AuNP) on an amine-terminated cubic boron nitride (cBN) surface deposited on a Si(001) substrate in the presence of reductant. The morphology of the AgNS/AuNP/NH2-cBN/Si(001) sample was characterized by scanning electron microscopy and X-ray diffraction. The performance of the AgNS/AuNP/NH2-cBN/Si(001) sample as surface-enhanced Raman scattering (SERS) active substrate was evaluated by using 4-aminothiophenol (PATP) as the probe molecule. The SERS measurements showed that the maximum intensity was obtained on the AgNS/AuNP/NH2-cBN/Si(001) sample for 5 min silver deposition. Compared with the AuNP/NH2-cBN/Si(001) sample and a silver film/cBN/Si(001) prepared by the mirror reaction, the SERS signal of PATP was obviously improved on the above AgNS/AuNP/NH2-cBN/Si(001) film. The sensitivity and the stability of the AgNS/AuNP/NH2-cBN/Si(001) sample were also investigated.

show abstract

Section: Detection Of Patp By the Sers Spectra On The Agns/aunp/nh2-csupporting

confidence: 38%

Surface-Enhanced Raman Scattering of 4-Aminothiophenol Adsorbed on Silver Nanosheets Deposited onto Cubic Boron Nitride Films

et al. 2010

View full text Add to dashboard Cite

show abstract

“…[57] Moreover, the encapsulated gold nanoparticles enable optical detection with Raman spectroscopy, [58,90] impart light-responsive behavior, [82] and facilitate remote laser control. [83] Other types of anisotropic gold nanoparticulates, such as nanorods and nanoplates, have also been incorporated into LbL films, [91][92][93] …”

Section: Gold Nanoparticles Rods and Platesmentioning

confidence: 99%

“…[127][128][129] Surface-enhanced Raman scattering (SERS) can also be utilized to study freestanding LbL structures containing gold and silver nanorods, nanowires, and tubules. [93,[130][131][132] Recently, we have applied this technique for the in situ detection of molecular-chain reorganization in deformed freestanding LbL films. The chain-like aggregation of gold nanoparticles in these films provides "hot spots", leading to a large enhancement of the Raman signals (SERS phenomenon) (Fig.…”

Section: Mechano-optical Propertiesmentioning

confidence: 99%

Freestanding Nanostructures via Layer‐by‐Layer Assembly

2006

View full text Add to dashboard Cite

Freestanding flexible nanocomposite structures fabricated by layer‐by‐layer (LbL) assembly are promising candidates for many potential applications, such as in the fields of thermomechanical sensing, controlled release, optical detection, and drug delivery. In this article, we review recent advances in the fabrication and characterization of different types of freestanding LbL structures in air and at air/liquid and liquid/liquid interfaces, including micro‐ and nanocapsules, microcantilevers, freely suspended membranes, encapsulated nanoparticle arrays, and sealed‐cavity arrays. Several recently developed fabrication techniques, such as spin‐assisted coating, dipping, and micropatterning, make the assembly process more efficient and impart novel physical properties to the freestanding films.

show abstract

“…In addition to lithographically produced Au nanorod arrays, 9 random aggregates of Au nanorods produced by chemical routes [10][11][12] are extensively investigated. However, it is not easy to immobilize the Au nanorods uniformly in isolation with each other.…”

mentioning

confidence: 99%

Au Nanorod Arrays Tailored for Surface-Enhanced Raman Spectroscopy

et al. 2007

View full text Add to dashboard Cite

IntroductionFor applying local field enhancement arising from local plasmons present in noble metal nanoparticles to biochemical sensors, such as surface-enhanced Raman scattering (SERS) sensors, it is important to control both the shape and the arrangement of the nanoparticles.1 It is well known that wellordered 2D periodic arrays of triangular nanoparticles prepared by nanosphere lithography (NSL) show plasma resonance within a rather narrow wavelength region, and the sharp corners of the triangles result in strong SERS.2 Although NSL enables the size of the nanoparticles to be tuned, the number density of the nanoparticles is geometrically fixed. Some applications, such as Raman imaging, may require more SERS-active spots to improve the space resolution. In addition, it is difficult to tune the lowest order of the local plasma resonance to the near-infrared (NIR) region, which is appropriate for biological applications. 3A drastic enhancement in the local field is considered to also occur at the ends of elongated nanoparticles. 4 In fact, for light in the visible to NIR region, SERS has been observed on arrays of elongated Ag nanoparticles, or so-called nanorods, whose widths are in the range of tens of nanometers and whose aspect ratios are 2 -5. 5-7 Liao et al. 5 prepared in-line aligned nanorod arrays on lithographically produced templates, while Martínes et al. 6 and Wachter et al. 7 produced side-by-side aligned nanorod arrays by oblique deposition. Taking into account the gap enhancement in the local field, 8 in-line alignment of the nanorods is more desirable than side-by-side alignment. However, even today, it is difficult to produce sub-micrometer patterns over large areas at low cost.Gold nanorods are also attracting much interest, since chemically stable Au is considered to be preferred to Ag for the material of the SERS substrates. In addition to lithographically produced Au nanorod arrays, 9 random aggregates of Au nanorods produced by chemical routes [10][11][12] are extensively investigated. However, it is not easy to immobilize the Au nanorods uniformly in isolation with each other.Recently, we demonstrated the direct formation of Ag nanorods with quasi-parallel major axes on a template layer of SiO2 having a strongly anisotropic surface morphology by using a dynamic oblique deposition (DOD) technique. 13 These Ag nanorods show excellent SERS properties. 14,15 In this study, we report that physically self-assembled Au nanorod arrays show fairly highly sensitive SERS properties that are comparable with those of Ag. ExperimentalThe preparation method of Au nanorod arrays is basically the same as that of Ag nanorod arrays reported in our previous papers.14,15 Briefly, template layers of SiO2 were prepared on a glass substrate by the serial bideposition (SBD) technique, which is a version of the vacuum evaporation technique. During SBD, the deposition angle, αSiO 2 , measured from the surface normal was fixed to 78.6˚, while the azimuth was rapidly changed by 180˚ with each deposition of a 10-nm-t...

show abstract

Fabrication, Characterization, and Application in SERS of Self-Assembled Polyelectrolyte−Gold Nanorod Multilayered Films

Cited by 144 publications

References 56 publications

Surface-Enhanced Raman Scattering of 4-Aminothiophenol Adsorbed on Silver Nanosheets Deposited onto Cubic Boron Nitride Films

Surface-Enhanced Raman Scattering of 4-Aminothiophenol Adsorbed on Silver Nanosheets Deposited onto Cubic Boron Nitride Films

Freestanding Nanostructures via Layer‐by‐Layer Assembly

Au Nanorod Arrays Tailored for Surface-Enhanced Raman Spectroscopy

Contact Info

Product

Resources

About