Patterning of Plasmonic Nanoparticles into Multiplexed One-Dimensional Arrays Based on Spatially Modulated Electrostatic Potential

Abstract

We report a new strategy to pattern plasmonic nanoparticles into multiplexed one-dimensional arrays based on the spatially modulated electrostatic potential. The 32 nm Au nanoparticles can be simultaneously deposited on one chip with tunable interparticle distance by solely adjusting the width of the grooves. Furthermore, 32 and 13 nm Au nanoparticles can be selectively deposited in grooves of different widths on one chip. As a result, the surface plasmon absorption bands on the chip can be tuned depending on the interparticle distance or the particle size of multiplex 1D arrays, which could enhance the Raman scattering cross section of the adsorbed molecules and result in multiplex surface-enhanced Raman scattering (SERS) response on the chip. This strategy provides a general method to fabricate 1D multiplex arrays with different particle sizes and interparticle distances on one chip.

Enhanced Photoresponse of Conductive Polymer Nanowires Embedded with Au Nanoparticles

“…In a typical experiment, gold microelectrode pairs were fi rst fabricated by standard photolithographic method on Si/SiO 2 (300 nm) substrate (Figure 1 B). [ 44 ] The interdistance of two proximate gold microelectrodes is kept at 2.5 µm. The Si/SiO 2 substrate was then functionalized with a monolayer of aminopropyltriethoxysilane (APTES) by the vacuum vapor method.…”

“…After that, 100 nm wide grooves were selectively defi ned on the PMMA resist between the gold microelectrodes by e-beam lithography (EBL). [ 44,46,47 ] Then, the Si/SiO 2 substrate with 1D groove patterned structure was immersed into 30 nm citrate-stabilized AuNP solution for 8 h, to achieve approximative 1D AuNP chain (Figure 1 D). The average distance between the nanoparticles was 30.8 nm and the interparticle distance distribution (relative standard deviation (RSD)) was around 8.4% ( Figure S1, Supporting Information).…”

“…[ 48 ] Based on the nanoparticle assembly principle, the interparticle distance is dependent on the thickness of Au particle electric double layer that can be adjusted by the ionic strength of the Au nanoparticle solution. [ 44,46 ] By increasing the ionic strength of the Au nanoparticle solution, more Au nanoparticle can be deposited into grooves of same width (100 nm) with the decreasing interparticle distances (30 to 10 nm). Therefore, the arrangement of 30 nm Au nanoparticle chain evolves from single line to double line ( Figure S4A-C, Supporting Information).…”

Label-free colorimetric logic gates based on free gold nanoparticles and the coordination strategy between cytosine and silver ions

“…[1][2][3] Over the past few decades, considerable efforts have been dedicated to replicating the Boolean logic gates on a molecular scale via various materials, such as organic molecules, proteins, nucleic acids, enzymes, and supramolecular hydrogels [4][5][6][7][8][9] that display a variety of logic outputs (e.g., AND, OR, XOR, etc.) [11][12][13][14][15][16] As a result, AuNPs represent an ideal platform to translate molecular events into logic systems with a large impact on the color properties of the solution, allowing to replicate Boolean logic gates on a molecular scale. 10 However, most of these logic gates employed fluorescence signals as their outputs, which were often limited by complex handling procedures and a lack of portability.…”

Facile Transferring of Wafer-Scale Ultrathin Alumina Membranes onto Substrates for Nanostructure Patterning

“…[1][2][3][4][5] In order to achieve ordered nanostructure patterning over a large area for device applications, lithographical processes, 6,7 imprinting techniques [8][9][10][11] or self-assembly methods [12][13][14] are adopted. 15,16 Among them, expensive and complex equipment and costly imprinting stamps are requisite for lithographical processes and imprinting techniques.…”