Towards a monolithically integrated microsystem based on the green tape ceramics technology for spectrophotometric measurements. Determination of chromium (VI) in water

Alves-Segundo, Ricardo; Ibáñez-García, Núria; Baeza, Mireia; Puyol, Mar; Alonso-Chamarro, Julián

doi:10.1007/s00604-010-0459-1

Cited by 15 publications

(14 citation statements)

References 36 publications

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“…S2, ESM). The electrode response vs. concentration of Cr(VI) ion were also investigated at different pH values (1)(2)(3)(4)(5)(6)(7)(8)(9) and their related graphs were also plotted separately (Fig. S2, ESM).…”

Section: -mentioning

confidence: 99%

“…Therefore, due to the high toxicity of Cr(VI) to living systems, its determination in environment is in great importance. A number of methods, such as spectrophotometric, atomic absorption spectroscopy (AAS), atomic emission spectroscopy (AES), inductively coupled plasma mass spectrometry (ICP-MS), chromatography, fluorescence spectroscopy and X-Ray fluorescence spectroscopy (XRF) are used for chromium ion determination at low concentration levels [3][4][5][6][7][8][9][10][11]. One of the major problems in most of these techniques is their inability of speciation and therefore the total chromium is measured.…”

Section: Introductionmentioning

confidence: 99%

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A solid state Cr(VI) ion-selective electrode based on polypyrrole

2012

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We report on a graphite electrode onto which polypyrrole was electrodeposited and then doped with chromate ion. This electrode can serve as a Cr(VI)-selective solid-state electrode. Electropolymerization of pyrrole was performed potentiostatically at 0.80 V (vs. SCE) using battery graphite as the working electrode in a solution containing 0.10 M of pyrrole and 20 mM of chromate. A platinum wire was used as an auxiliary electrode. The new electrode displays high selectivity, a very wide dynamic range, a sufficiently fast response time and a good shelf lifetime. It shows a linear Nernstian response over 1.0×10 −6 to 1.0×10 −1 M concentration range (with a slope of 26.55±0.20 mV per log of concentration). The detection limit is 0.5 μM, and the pH optimum is 7.0.

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Section: -mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A solid state Cr(VI) ion-selective electrode based on polypyrrole

2012

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“…K) is of interest for electronics integration as it allows the integration of printed resistors in a multilayer structure, facilitating the creation of a high-density package with reduced parasitic effects and fewer problems with electromagnetic compatibility [30]. The substrates also have acceptable dielectric properties at high frequencies[31] and they can be integrated with microfluidic structures 32. A visual comparison of the differences in the heat dissipation based upon substrate selection can be seen inFigure 3b.…”

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confidence: 99%

Transferrable AlGaN/GaN High-Electron Mobility Transistors to Arbitrary Substrates via a Two-Dimensional Boron Nitride Release Layer

Motala

Blanton

Hilton

et al. 2020

ACS Appl. Mater. Interfaces

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Mechanical transfer of high performing thin film devices onto arbitrary substrates represents an exciting opportunity to improve device performance, explore non-traditio na l 2 manufacturing approaches, and paves the way for soft, conformal, and flexible electronics. Using a two-dimensional (2D) boron nitride (BN) release layer, we demonstrate the transfer of AlGaN/GaN high-electron mobility transistors (HEMTs) to arbitrary substrates through both direct van der Waals (vdW) bonding and with a polymer adhesive interlayer. No device degradation was observed due to the transfer process, and a significant reduction in device temperature (327 °C to 132 °C at 600 mW) was observed when directly bonded to a silicon carbide (SiC) wafer relative to the starting wafer. With the use of a benzocyclobutene (BCB) adhesion interlayer, devices were easily transferred and characterized on Kapton and ceramic films, representing an exciting opportunity for integration onto arbitrary substrates. Upon reduction of this polymer adhesive layer thickness, the AlGaN/GaN HEMTs transferred onto a BCB/SiC substrate resulted in comparable peak temperatures during operation at powers as high as 600 mW to the as-grown wafer, revealing that by optimizing interlayer characteristics such as thickness and thermal conductivity, transferrable devices on polymer layers can still improve performance outputs.

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“…Most of them involve the integration of a glass window onto the microfluidic device for its later coupling to an optical detection system usually based on a LED and a photodetector. Modular microanalyzers with these features include devices that have been used to determine chromium(VI) 9 and cobalt(II) 10 in water and urea in milk. 11 Other modular colorimetric microanalyzers use optical fibers as an intermediate stage to the optical detection system.…”

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confidence: 99%