Repair of thin thermally grown silicon dioxide by anodic oxidation

Chen, Li; Zhou, Ying‐Lin; Krause, Steffi; Muñoz, Ana; Kunze, Julia; Schmuki, Patrik

doi:10.1016/j.electacta.2007.11.065

Cited by 21 publications

(7 citation statements)

References 29 publications

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“…The C p /R p and the C sc /R sc pairs represent the capacitive and resistive behaviors of the surface layer and the space charge region of the surface layer, respectively. The constant phase element ͑CPE͒ presents the effect of defects in the surface layer 42 and R CPE represents the resistance of the CPE in the equivalent circuit. The CPE element, which compensates for the nonhomogeneity in the system, is defined by two values, Q and n. The impedance, Z, of CPE is presented by Eq.…”

Section: C252mentioning

confidence: 99%

In Situ Electrochemical Analysis of Surface Layers on a Pyrrhotite Electrode in Hydrochloric Acid Solution

Ghahremaninezhad

Asselin

Dixon

2010

J. Electrochem. Soc.

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The present study considers the electrochemical dissolution of pyrrhotite electrodes in 1 M HCl solution. Conventional electrochemical techniques as well as electrochemical impedance spectroscopy ͑EIS͒ and in situ Mott-Schottky analysis have been applied for surface studies during the anodic dissolution of the electrode. EIS results showed the formation of two distinct surface layers on the electrode. The first layer forms during sample preparation and is stable up to around 600 mV vs saturated calomel electrode ͑SCE͒. The second layer starts to form at high anodic potentials ͑Ͼ670 mV vs SCE͒. Electrochemically active dissolution of the pyrrhotite occurs between the formation potential of the two surface layers ͑600-670 mV vs SCE͒. Mott-Schottky plots showed that both of the layers are n-type semiconductors with quite different donor densities. Moreover, the second surface layer is less conductive than the first and thus hinders the dissolution current more effectively. Three different equivalent electrochemical circuits were modeled for different dissolution potential ranges and the model regression results was compared to the experimental results of the EIS.

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Section: C252mentioning

confidence: 99%

In Situ Electrochemical Analysis of Surface Layers on a Pyrrhotite Electrode in Hydrochloric Acid Solution

Ghahremaninezhad

Asselin

Dixon

2010

J. Electrochem. Soc.

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“…The semiconductor is usually made of silicon bulk, covered with a thermally oxidized SiO 2 layer. In order to reduce the recombination of photocarriers and improve spatial resolution, the silicon bulk can be replaced with thin silicon films (thinned silicon substrate [38,39,40], silicon on insulator (SOI) [18], amorphous silicon (a-Si) [41,42,43,44] and silicon on sapphire (SOS) [45,46]) or other semiconductor thin layers deposited on transparent substrates (GaAs [47], GaN [48], In-Ga-Zn oxide (IGZO) [49] and indium tin oxide (ITO) [50]). The sensing material such as Si 3 N 4 [1,28,38,39,51], Al 2 O 3 [52,53,54], Ta 2 O 5 [51], HfO 2 [55,56,57], NbO x [40,58,59], SnO x [60], self-assembled organic monolayer (SAM) [61,62] and nanofibers [63,64] can be used for pH sensing.…”

Section: Measurement System Set-upmentioning

confidence: 99%

Recent Developments of High-Resolution Chemical Imaging Systems Based on Light-Addressable Potentiometric Sensors (LAPSs)

Liang

Qiu

Gan

et al. 2019

Sensors

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A light-addressable potentiometric sensor (LAPS) is a semiconductor electrochemical sensor based on the field-effect which detects the variation of the Nernst potential on the sensor surface, and the measurement area is defined by illumination. Thanks to its light-addressability feature, an LAPS-based chemical imaging sensor system can be developed, which can visualize the two-dimensional distribution of chemical species on the sensor surface. This sensor system has been used for the analysis of reactions and diffusions in various biochemical samples. In this review, the LAPS system set-up, including the sensor construction, sensing and substrate materials, modulated light and various measurement modes of the sensor systems are described. The recently developed technologies and the affecting factors, especially regarding the spatial resolution and temporal resolution are discussed and summarized, and the advantages and limitations of these technologies are illustrated. Finally, the further applications of LAPS-based chemical imaging sensors are discussed, where the combination with microfluidic devices is promising.

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“…26 The Q p /R p pair represents the capacitive and resistive behaviors of the passive film, and, considering the defects in the passive layer, Q p is substituted for capacitor C p to give a more accurate fit. 27,28 The values of the different elements in the equivalent circuit at 350/450 mV are shown in Table 2.…”

Section: Low Anodic Potentials (Ocp To 470 Mv)mentioning

confidence: 99%

Effect of pyrite on the electrochemical behavior of chalcopyrite at different potentials in pH 1.8 H₂SO₄

Liu

Wang

Chen

et al. 2019

Journal of Chemical Research

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Chalcopyrite is the most abundant, but also one of the most refractory, copper sources. One way to enhance chalcopyrite’s electrochemical dissolution is by mixing it with pyrite. To understand how and to what extent pyrite affects chalcopyrite’s electrochemical dissolution at different potentials, the electrochemical behaviors of chalcopyrite, pyrite, and chalcopyrite–pyrite couples in pH 1.8 H2SO4 were studied by potentiodynamic and electrochemical impedance spectroscopy. Potentiodynamic curves showed their different electrochemical reaction states and electrode surface characteristics. From open-circuit potential to 470 mV (vs saturated calomel electrode), chalcopyrite–pyrite was passivated with Cu1− xFe1− yS2 [Formula: see text]; from 470 to 580 mV, trans-passive dissolution occurred, and in the passive region, Cu1− xFe1− yS2 transformed into Cu1− x− zS2; from 580 to 700 mV was an active region; and a pseudo-passive region was formed with CuS when the potential was above 700 mV. The smaller charge transfer resistance and passive resistance, as well as the smaller inductive relaxation, revealed how and to what extent the coupled pyrite accelerated the electrochemical dissolution of chalcopyrite.

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Repair of thin thermally grown silicon dioxide by anodic oxidation

Cited by 21 publications

References 29 publications

In Situ Electrochemical Analysis of Surface Layers on a Pyrrhotite Electrode in Hydrochloric Acid Solution

In Situ Electrochemical Analysis of Surface Layers on a Pyrrhotite Electrode in Hydrochloric Acid Solution

Recent Developments of High-Resolution Chemical Imaging Systems Based on Light-Addressable Potentiometric Sensors (LAPSs)

Effect of pyrite on the electrochemical behavior of chalcopyrite at different potentials in pH 1.8 H₂SO₄

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Repair of thin thermally grown silicon dioxide by anodic oxidation

Cited by 21 publications

References 29 publications

In Situ Electrochemical Analysis of Surface Layers on a Pyrrhotite Electrode in Hydrochloric Acid Solution

In Situ Electrochemical Analysis of Surface Layers on a Pyrrhotite Electrode in Hydrochloric Acid Solution

Recent Developments of High-Resolution Chemical Imaging Systems Based on Light-Addressable Potentiometric Sensors (LAPSs)

Effect of pyrite on the electrochemical behavior of chalcopyrite at different potentials in pH 1.8 H2SO4

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Effect of pyrite on the electrochemical behavior of chalcopyrite at different potentials in pH 1.8 H₂SO₄