Fabrication of ordered tubular porous silicon structures by colloidal lithography and metal assisted chemical etching: SERS performance of 2D porous silicon structures

Balderas‐Valadez, Ruth Fabiola; Estévez-Espinoza, J.O.; Salazar-Kuri, U.; Pacholski, Claudia; Mochán, W. Luis; Agarwal, Vivechana

doi:10.1016/j.apsusc.2018.08.120

Cited by 23 publications

(9 citation statements)

References 26 publications

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“…These techniques require sophisticated laboratory equipment. More cost-efficient approaches based on colloidal lithography (Balderas-Valadez et al, 2018; Zhang T. et al, 2018) or biological templates (Wu et al, 2018) have been investigated for fabricating SERS substrates, but their wide spread use is challenged by the requested reproducibility of SERS enhancement—over the whole substrate surface and in different batches of SERS substrates. However, SERS is a powerful technique, which was already employed for detecting a variety of analytes ranging from explosives (Ben-Jaber et al, 2017) to bacteria (Wang et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

One Spot—Two Sensors: Porous Silicon Interferometers in Combination With Gold Nanostructures Showing Localized Surface Plasmon Resonance

2019

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Sensors composed of a porous silicon monolayer covered with a film of nanostructured gold layer, which provide two optical signal transduction methods, are fabricated and thoroughly characterized concerning their sensing performance. For this purpose, silicon substrates were electrochemically etched in order to obtain porous silicon monolayers, which were subsequently immersed in gold salt solution facilitating the formation of a porous gold nanoparticle layer on top of the porous silicon. The deposition process was monitored by reflectance spectroscopy, and the appearance of a dip in the interference pattern of the porous silicon layer was observed. This dip can be assigned to the absorption of light by the deposited gold nanostructures leading to localized surface plasmon resonance. The bulk sensitivity of these sensors was determined by recording reflectance spectra in media having different refractive indices and compared to sensors exclusively based on porous silicon or gold nanostructures. A thorough analysis of resulting shifts of the different optical signals in the reflectance spectra on the wavelength scale indicated that the optical response of the porous silicon sensor is not influenced by the presence of a gold nanostructure on top. Moreover, the adsorption of thiol-terminated polystyrene to the sensor surface was solely detected by changes in the position of the dip in the reflectance spectrum, which is assigned to localized surface plasmon resonance in the gold nanostructures. The interference pattern resulting from the porous silicon layer is not shifted to longer wavelengths by the adsorption indicating the independence of the optical response of the two nanostructures, namely porous silicon and nanostructured gold layer, to refractive index changes and pointing to the successful realization of two sensors in one spot.

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Section: Introductionmentioning

confidence: 99%

One Spot—Two Sensors: Porous Silicon Interferometers in Combination With Gold Nanostructures Showing Localized Surface Plasmon Resonance

2019

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“…In addition to a controllable and large exposed surface area that might be decorated with a functional material [32], PSi pillar structures have been demonstrated to be useful in the optical detection of chemical analytes [33]. Highly ordered patterned 3D structures provide wide number of sensitive, selective and stable fingerprint-sensing devices [33,34].…”

Section: Introductionmentioning

confidence: 99%

Porous silicon pillar structures/photosynthetic reaction centre protein hybrid for bioelectronic applications

Hajdu

Balderas‐Valadez

Carlino

et al. 2021

Photochem Photobiol Sci

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Photosynthetic biomaterials have attracted considerable attention at different levels of the biological organisation, from molecules to the biosphere, due to a variety of artificial application possibilities. During photosynthesis, the first steps of the conversion of light energy into chemical energy take place in a pigment–protein complex, called reaction centre (RC). In our experiments photosynthetic reaction centre protein, purified from Rhodobacter sphaeroides R-26 purple bacteria, was bound to porous silicon pillars (PSiP) after the electropolymerisation of aniline onto the surface. This new type of biohybrid material showed remarkable photoactivity in terms of measured photocurrent under light excitation in an electrochemical cell. The photocurrent was found to increase considerably after the addition of ubiquinone (UQ-0), an e−-acceptor mediator of the RC. The photoactivity of the complex was found to decrease by the addition of terbutryn, the chemical which inhibits the e−-transport on the acceptor side of the RC. In addition to the generation of sizeable light-induced photocurrents, using the PSiP/RC photoactive hybrid nanocomposite material, the system was found to be sensitive towards RC inhibitors and herbicides. This highly ordered patterned 3D structure opens new solution for designing low-power (bio-)optoelectronic, biophotonic and biosensing devices. Graphical abstract

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“…However, the Raman intensity becomes weak when detecting tiny amounts of target molecules. To overcome this issue, surface-enhanced Raman scattering (SERS) has been developed to improve the sensitivity of Raman detection 3 , which can provide an ultra-sensitive spectral analysis of probing molecules. Beyond the metal-like plasmonic materials (e.g., silicon sandwich, graphene, and titanium nitride), noble metals (Au, Ag, Cu) with coarse surface are active SERS substrate 4–10 .…”

Section: Introductionmentioning

confidence: 99%

Organic Molecule Detection Based on SERS in Microfluidics

Zhang

Yan

et al. 2019

Sci Rep

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Sensitive in situ detection of organic molecules is highly demanded in environmental monitoring. In this work, the surface enhanced Raman spectroscopy (SERS) is adopted in microfluidics to detect the organic molecules with high accuracy and high sensitivity. Here the SERS substrate in microchannel consists of Ag nanoparticles synthesized by chemical reduction. The data indicates the fabrication conditions have great influence on the sizes and distributions of Ag nanoparticles, which play an important role on the SERS enhancement. This result is further confirmed by the simulation of electromagnetic field distributions based on finite difference time domain (FDTD) method. Furthermore, the SERS spectra of organic molecule (methylene blue) obtained in this plasmonic microfluidic system exhibit good reproducibility with high sensitivity. By a combination of SERS and microfluidics, our work not only explores the research field of plasmonics but also has broad application prospects in environmental monitoring.

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Fabrication of ordered tubular porous silicon structures by colloidal lithography and metal assisted chemical etching: SERS performance of 2D porous silicon structures

Cited by 23 publications

References 26 publications

One Spot—Two Sensors: Porous Silicon Interferometers in Combination With Gold Nanostructures Showing Localized Surface Plasmon Resonance

One Spot—Two Sensors: Porous Silicon Interferometers in Combination With Gold Nanostructures Showing Localized Surface Plasmon Resonance

Porous silicon pillar structures/photosynthetic reaction centre protein hybrid for bioelectronic applications

Organic Molecule Detection Based on SERS in Microfluidics

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