Silicon nanopillar arrays with SiO_2 overlayer for biosensing application

Choudhury, Bikash Dev; Casquel, Rafael; Bañuls, María‐José; Sanza, Francisco J.; Heras, María Fe Laguna; Holgado, Miguel; Puchades, Rosa; Maquieira, Ángel; Barrios, Carlos Angulo; Anand, Srinivasan

doi:10.1364/ome.4.001345

Cited by 32 publications

(15 citation statements)

References 29 publications

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“…Structuring the surface of the layer by means of the fabrication of pillars [18][19][20][21], holes [22,23], or using a layer of porous material could increase the sensing surface of the sensing cell, besides presenting a particular confinement of the light [24] which may result in a better sensitivity or limit of detection. Biosensors based on porous silicon were reported in 1997 [25] and many variations on the same biosensing principle have been also reported since [26], using layers with a variety of porosity values and configurations.…”

Section: Vertical Sensorsmentioning

confidence: 99%

Engineering vertically interrogated interferometric sensors for optical label-free biosensing

et al. 2020

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In this work, we review the technology of vertically interrogated optical biosensors from the point of view of engineering. Vertical sensors present several advantages in the fabrication processes and in the light coupling systems, compared with other interferometric sensors. Four different interrelated aspects of the design are identified and described: sensing cell design, optical techniques used in the interrogation, fabrication processes, fluidics, and biofunctionalization of the sensing surface. The designer of a vertical sensor should decide carefully which solution to adopt on each aspect to finally integrating all the components in a single platform. Complexity, cost, and reliability of this platform will be determined by the decisions taken on each of the design process. We focus in the research and experience acquired by our group during last years on the field of optical biosensors.

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Section: Vertical Sensorsmentioning

confidence: 99%

Engineering vertically interrogated interferometric sensors for optical label-free biosensing

et al. 2020

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“…The potential of diamond as an electrochemical transducer has attracted remarkable interest due to its chemical stability, wide potential window, low background current and bio-compatibility [53,[84][85][86] of other commonly exploited materials such as silicon (Si) [87,88], silicon dioxide (SiO 2 ) [89,90], tin dioxide (SnO 2 ) [91,92], gold (Au) [93,94] and glassy carbon [95,96]. High-quality diamond films typically possess a potential window of ≥ 3.25 V, owing to the large over-potentials for both oxygen and hydrogen evolution [97,98] as a result of diamond to be either insulating, semiconducting or metallic, with its appearance moving from transparent to black (optical gap of 5.47 eV), as a result of diamonds ability to be either p-or n-type doped [97][98][99].…”

Section: Diamondmentioning

confidence: 99%

Carbon nanomaterials and their application to electrochemical sensors: a review

Power¹,

Gorey²,

Chandra³

et al. 2018

Nano Online

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Carbon has long been applied as an electrochemical sensing interface owing to its unique electrochemical properties. Moreover, recent advances in material design and synthesis, particularly nanomaterials, has produced robust electrochemical sensing systems that display superior analytical performance. Carbon nanotubes (CNTs) are one of the most extensively studied nanostructures because of their unique properties. In terms of electroanalysis, the ability of CNTs to augment the electrochemical reactivity of important biomolecules and promote electron transfer reactions of proteins is of particular interest. The remarkable sensitivity of CNTs to changes in surface conductivity due to the presence of adsorbates permits their application as highly sensitive nanoscale sensors. CNT-modified electrodes have also demonstrated their utility as anchors for biomolecules such as nucleic acids, and their ability to diminish surface fouling effects. Consequently, CNTs are highly attractive to researchers as a basis for many electrochemical sensors. Similarly, synthetic diamonds electrochemical properties, such as superior chemical inertness and biocompatibility, make it desirable both for (bio) chemical sensing and as the electrochemical interface for biological systems. This is highlighted by the recent development of multiple electrochemical diamond-based biosensors and bio interfaces.Keywords: bio sensors; carbon nanomaterials; carbon nanotubes; electrochemical sensing; synthetic diamond Users without a subscription are not able to see the full content. Please, subscribe or login to access all content.

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“…In general, the formation for such oxide thin lms should be conducted in mild conditions to remain the optical and mechanical properties of polymer substrate, therefore, the traditional micropatterning strategies involving erosive chemicals or high temperature conditions are no longer favoured. 7,12,13 Silica micron/submicron-sized patterns were reported to be fabricated on substrates for the application in patterning techniques, 13,14 optics, 15,16 optoelectronics, 17 microelectronics, 18 sensors, 19 and biotechnology. 20,21 A top-down approach for the silica patterning applicable to arbitrary substrates was reported, which sputtered silica lms onto photoresist-patterned surface.…”

Section: Introductionmentioning

confidence: 99%