Alkanethiol self-assembled monolayer on copper polycrystalline thin films: Influence on resistivity

Flores, Marcos; Donoso, Sebastián; Ortiz, Magdalena; Acosta, Gabriela; Fernández, Henry

doi:10.1016/j.matchemphys.2018.01.034

Cited by 11 publications

(3 citation statements)

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“…Raman experiments were performed ex situ (in air) using a Horiba LabRAM HR spectrometer (Sunnyvale, CA, USA), employing a He/Ne laser (632.8 nm wavelength). Using an XPS-Auger Perkin Elmer Model PHI 1257 spectrometer (Waltham, MA, USA) was employed to determine the chemical composition of samples, by means of HRXPS and using the method described previously [48][49][50]. For AFM measurements, a Nanonics Multi View MV1000 was employed using n-type silicon cantilevers (tip radius ≈ 20 nm; f = 39.4 kHz; Q = 1576) for the intermittent mode.…”

Section: Methodsmentioning

confidence: 99%

Exploration of Copper Oxide Nanoneedle Electrosynthesis Applied in the Degradation of Methylene Blue

et al. 2021

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In this study, we report a low cost, fast and unexplored electrochemical synthesis strategy of copper oxide nanoneedles films as well as their morphological and chemical characterization. The nanostructured films were prepared using electrochemical anodization in alkaline electrolyte solutions of ethylene glycol, water and fluoride ions. The film morphology shows nanoneedle-shaped structures, with lengths up to 1–2 μm; meanwhile, high-resolution X-ray photoelectron spectroscopy (HRXPS) and spectroscopy Raman analyses indicate that a mixture of Cu(II) and Cu(I) oxides, or only Cu(I) oxide, is obtained as the percentage of water in the electrolyte solution decreases. A preliminary study was also carried out for the photocatalytic degradation of the methylene blue (MB) dye under irradiation with simulated sunlight in the presence of the nanoneedles obtained, presenting a maximum degradation value of 88% of MB and, thus, demonstrating the potential characteristics of the material investigated in the degradation of organic dyes.

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Section: Methodsmentioning

confidence: 99%

Exploration of Copper Oxide Nanoneedle Electrosynthesis Applied in the Degradation of Methylene Blue

et al. 2021

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“…The surface roughness also plays a very important role in the quality of SAM that has a significant impact on charge transfer across the organic thin‐film [41]. The topographical properties of a surface also depend on the thickness of films and the surface roughness increases for the thicker film [42]. So, it is essential to investigate the surface roughness of the Au surface to get the best quality of SAM for BioMEMS application.…”

Section: Surface Roughness Analysismentioning

confidence: 99%

Fabrication, calibration, and preliminary testing of microcantilever‐based piezoresistive sensor for BioMEMS applications

Rotake

Darji

Kale

2020

IET nanobiotechnol.

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In this study, the authors demonstrate the fabrication, calibration, and testing of a piezoresistive microcantileverbased sensor for biomedical microelectromechanical system (BioMEMS) application. To use any sensor in BioMEMS application requires surface modification to capture the targeted biomolecules. The surface alteration comprises self-assembled monolayer (SAM) formation on gold (Au)/chromium (Cr) thin films. So, the Au/Cr coating is essential for most of the BioMEMS applications. The fabricated sensor uses the piezoresistive technique to capture the targeted biomolecules with the SAM/Au/Cr layer on top of the silicon dioxide layer. The stiffness (k) of the cantilever-based biosensor is a crucial design parameter for the low-pressure range and also influence the sensitivity of the microelectromechanical system-based sensor. Based on the calibration data, the average stiffness of the fabricated microcantilever with and without Au/Cr thin film is 141.39 and 70.53 mN/m, respectively, which is well below the maximum preferred range of stiffness for BioMEMS applications. The fabricated sensor is ultra-sensitive and selective towards Hg 2+ ions in the presence of other heavy metal ions (HMIs) and good enough to achieve a lower limit of detection 0.75 ng/ml (3.73 pM/ml).

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“…Topographical properties of a surface also depend on the thickness of films and the surface roughness increases for thicker film Flores et al (2018). So, it is essential to investigate the surface roughness of the gold surface to get the best quality of SAM for the Biosensor application.…”

Section: Characterization Of Thin-film For Selective Mercury Ions Detectionmentioning

confidence: 99%

Thin-film based sensor for the selective detection of mercury (Hg²⁺) ions at the picomolar range

Rotake

Darji

Singh

2020

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Purpose The purpose of this paper is a new thin-film based sensor proposed for sensitive and selective detection of mercury (Hg2+) ions in water. The thin-film platform is easy to use and quick for heavy metal ions (HMIs) detection in the picomolar range. Ion-selective self-assembled monolayer's (SAM) of thiol used for the detection of HMIs above the Au/Ti top surface. Design/methodology/approach A thin-film based platform is suitable for the on-field experiments and testing of water samples. HMIs (antigen) and thiol-based SAM (antibody) interaction results change in surface morphology and topography. In this study, the authors have used different characterization techniques to check the selectivity of the proposed method. This change in the morphology and topography of thin-film sensor checked with Fourier-transform infrared spectroscopy, surface-enhanced Raman scattering spectroscopy, atomic force microscopy and scanning electron microscopy with energy dispersive x-ray analysis used for high-resolution images. Findings This thin-film based platform is straightforward to use and suitable for real-time detection of HMIs at the picomolar range. This thin-film based sensor platform capable of achieving a lower limit of detection (LOD) 27.42 ng/mL (136.56 pM) using SAM of Homocysteine-Pyridinedicarboxylic acid to detect Hg2+ ions. Research limitations/implications A thin-film based technology is perfect for real-time testing and removal of HMIs, but the LOD is higher as compared to microcantilever-based devices. Originality/value The excessive use and commercialization of nanoparticle (NPs) are quickly expanding their toxic impact on health and the environment. The proposed method used the combination of thin-film and NPs, to overcome the limitation of NPs-based technique and have picomolar (136.56 pM) range of HMIs detection. The proposed thin-film-based sensor shows excellent repeatability and the method is highly reliable for toxic Hg2+ ions detection. The main advantage of the proposed thin-film sensor is its ability to selectively remove the Hg2+ ions from water samples just like a filter and a sensor for detection at picomolar range makes this method best among the other current-state of the art techniques.

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Alkanethiol self-assembled monolayer on copper polycrystalline thin films: Influence on resistivity

Cited by 11 publications

References 31 publications

Exploration of Copper Oxide Nanoneedle Electrosynthesis Applied in the Degradation of Methylene Blue

Exploration of Copper Oxide Nanoneedle Electrosynthesis Applied in the Degradation of Methylene Blue

Fabrication, calibration, and preliminary testing of microcantilever‐based piezoresistive sensor for BioMEMS applications

Thin-film based sensor for the selective detection of mercury (Hg²⁺) ions at the picomolar range

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Alkanethiol self-assembled monolayer on copper polycrystalline thin films: Influence on resistivity

Cited by 11 publications

References 31 publications

Exploration of Copper Oxide Nanoneedle Electrosynthesis Applied in the Degradation of Methylene Blue

Exploration of Copper Oxide Nanoneedle Electrosynthesis Applied in the Degradation of Methylene Blue

Fabrication, calibration, and preliminary testing of microcantilever‐based piezoresistive sensor for BioMEMS applications

Thin-film based sensor for the selective detection of mercury (Hg2+) ions at the picomolar range

Contact Info

Product

Resources

About

Thin-film based sensor for the selective detection of mercury (Hg²⁺) ions at the picomolar range