Surface Nanometer‐Scale Patterning in Realizing Large‐Scale Ordered Arrays of Metallic Nanoshells with Well‐Defined Structures and Controllable Properties

Yang, Shikuan; Cai, Weiping; Kong, Lingce; Lei, Yong

doi:10.1002/adfm.201000467

Cited by 127 publications

(105 citation statements)

References 37 publications

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“…[22][23][24][25][26] Especially, monolayer colloidal crystals (MCCs) are effi cient templates for fabricating surface patterns. [27][28][29][30][31][32][33][34] Colloidal lithography using MCCs as lithographic masks is a well-known method that has been widely used to fabricate honeycomb arrays of triangular nanoparticles. [35][36][37] These triangular particles are located at the interstices of three adjacent spheres in the MCC templates, and each triangular particle has three close neighboring particles.…”

Section: Introductionmentioning

confidence: 99%

Template‐Confined Dewetting Process to Surface Nanopatterns: Fabrication, Structural Tunability, and Structure‐Related Properties

Yang

Xing

Ostendorp

et al. 2011

Adv Funct Materials

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127

124

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Metallic surface nanopatterns are prepared by a template-confi ned dewetting process with multiple structural controllabilities. The morphology of the building blocks is homogeneous throughout the surface nanopatterns, as the dewetting process proceeds separately in each bowl. The features of the building units in the surface patterns are highly dependent on the annealing temperature. Importantly, the size and composition of the nanoparticles in the surface nanopatterns can be pre-calculated and designed by manipulating the thickness of the evaporated metallic fi lms. The heating temperature and composition of the building units infl uence the surface-enhanced Raman scattering (SERS) and plasmonic properties, thus tuning the localized surface plasmon resonance peaks over a broad range (from visible to near infrared). The introduction of silver in the gold surface nanopatterns enhances the SERS performance dramatically. This work not only provides a powerful route to fabricate surface nanopatterns, but also supplies a platform to study the mechanism of the complicated dewetting processes of metals.

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Section: Introductionmentioning

confidence: 99%

Template‐Confined Dewetting Process to Surface Nanopatterns: Fabrication, Structural Tunability, and Structure‐Related Properties

Yang

Xing

Ostendorp

et al. 2011

Adv Funct Materials

Self Cite

127

124

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“…Among various analytical techniques, surface-enhanced Raman scattering (SERS) is among the most promising methods in detecting trace amounts of molecules owing to its high molecular specificity (i.e., differentiation between different types of molecules) and high sensitivity (i.e., the lowest analyte concentration from which SERS signals are distinguishable from the noise signal of a control sample) (9)(10)(11)(12)(13)(14)(15)(16)(17). Extensive studies have focused on the structural optimization of the SERS substrate to improve SERS sensitivity (18)(19)(20)(21)(22), but there are two important roadblocks that limit its practical applications. First, SERS detection in liquid media relies on highly statistical binding of analytes to the SERS-sensitive regions (or "hot spots"), a consequence of the diffusive nature of the analytes (23)(24)(25)(26)(27).…”

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confidence: 99%

Ultrasensitive surface-enhanced Raman scattering detection in common fluids

Yang

Dai

Stogin

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

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635

442

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Detecting target analytes with high specificity and sensitivity in any fluid is of fundamental importance to analytical science and technology. Surface-enhanced Raman scattering (SERS) has proven to be capable of detecting single molecules with high specificity, but achieving single-molecule sensitivity in any highly diluted solutions remains a challenge. Here we demonstrate a universal platform that allows for the enrichment and delivery of analytes into the SERSsensitive sites in both aqueous and nonaqueous fluids, and its subsequent quantitative detection of Rhodamine 6G (R6G) down to ∼75 fM level (10 −15 mol·L −1 ). Our platform, termed slippery liquidinfused porous surface-enhanced Raman scattering (SLIPSERS), is based on a slippery, omniphobic substrate that enables the complete concentration of analytes and SERS substrates (e.g., Au nanoparticles) within an evaporating liquid droplet. Combining our SLIPSERS platform with a SERS mapping technique, we have systematically quantified the probability, p(c), of detecting R6G molecules at concentrations c ranging from 750 fM (p > 90%) down to 75 aM (10 −18 mol·L −1 ) levels (p ≤ 1.4%). The ability to detect analytes down to attomolar level is the lowest limit of detection for any SERS-based detection reported thus far. We have shown that analytes present in liquid, solid, or air phases can be extracted using a suitable liquid solvent and subsequently detected through SLIPSERS. Based on this platform, we have further demonstrated ultrasensitive detection of chemical and biological molecules as well as environmental contaminants within a broad range of common fluids for potential applications related to analytical chemistry, molecular diagnostics, environmental monitoring, and national security.spectroscopy | sensing | SERS | slippery surfaces | nanoparticles

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“…Abdelsalam et al [42] achieved detection of a flavin analog with sub-femtomolar limit of detection using colloidal templates to produce Ag patterns of inverse hexagonal arrays for electrochemical SERS. Recent developments have resulted in substrates with large areas patterned on the nanoscale, as demonstrated by the work of Cai et al [43]. They first prepared polystyrene (PS) colloidal ordered array by spin-coating, then deposited a 3-nm thick silver film on the PS microspheres by sputtering.…”

Section: Sers Has Emerged As a New Powerful Analytical Techniquementioning

confidence: 99%

Plasmonic biosensors and nanoprobes based on gold nanoshells

Rao

et al. 2011

Chin. Sci. Bull.

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Gold nanoshells (GNSs), consisting of a dielectric core coated with gold, have gained extensive attention as they show readily tunable optical properties and good biocompatibility. As highly sensitive and label-free optical biosensors with wide applications, GNSs have been investigated in many fields including drug delivery, immunoassay, cancer treatment, biological sensing and imaging. Taking advantage of the adjustability of the local surface plasmon resonance (LSPR) and the sensitivity of the surfaceenhanced Raman scattering (SERS) signal of GNSs, we have developed diverse applications including plasmonic biosensors and nanoprobes based on GNSs. In this review we introduce plasmonic and electromagnetic properties and fabrication methods of GNSs. We describe research progress in recent years, and highlight several applications of GNSs developed by our group. Finally we provide a brief assessment of future development of GNSs as plasmonic materials that can be integrated with complementary analytical techniques. With advances of technology, one-component materials can no longer meet the needs of society. Thus researchers have fabricated composite materials from two or more materials with complementary functions and optimization of performance [1][2][3][4]. In addition, nanomaterials of noble metals have gained widespread attention with their excellent physical and chemical properties and biocompatibility. Gold, as a typical representative of nanomaterials, has become the noble metal with the most dynamic research and development potential. Furthermore, novel core-shell structured nanomaterials with a variety of shapes, structures and/or controllable components have aroused intense interest in recent years. As a result, gold nanoshells (GNSs) have emerged as metal nanocomposite materials of great interest. GNSs containing a spherical dielectric core surrounded by an ultrathin, conductive gold layer not only offer superiority in performance but also great potential for developing simple, fast, and lowcost bioanalytical methods for biosensing and nanoprobes. As a new type of nanocomposite material, GNSs possess many notable features. Their linear optical properties, infrared extinction characteristics, photothermal conversion properties, acoustic properties, cavity absorption and electron dynamics characteristics, make GNSs a focal point of basic and applied research. In addition to tunable LSPR among other features, GNSs show a strong electromagnetic enhancement effect, which makes GNSs a potentially ideal active SERS substrate [5,6]. Research in this area has revealed many new phenomena and raised many new issues, and provided new principles and new methods for nano-characterization technology and sensor technology, which will lead to new types of ultra-high sensitivity sensors for LSPR and SERS. This paper will focus on the fabrication of GNSs and research progress in the field in chemical/biological sensing and surface-enhanced spectroscopy.

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Surface Nanometer‐Scale Patterning in Realizing Large‐Scale Ordered Arrays of Metallic Nanoshells with Well‐Defined Structures and Controllable Properties

Cited by 127 publications

References 37 publications

Template‐Confined Dewetting Process to Surface Nanopatterns: Fabrication, Structural Tunability, and Structure‐Related Properties

Template‐Confined Dewetting Process to Surface Nanopatterns: Fabrication, Structural Tunability, and Structure‐Related Properties

Ultrasensitive surface-enhanced Raman scattering detection in common fluids

Plasmonic biosensors and nanoprobes based on gold nanoshells

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