Oxidation mechanism of thin Cu films: A gateway towards the formation of single oxide phase

Choudhary, Sumita; Sarma, J. V. N.; Pande, Surojit; Ababou‐Girard, Soraya; Turban, Pascal; Lépine, Bruno; Gangopadhyay, S.

doi:10.1063/1.5028407

Cited by 164 publications

(91 citation statements)

References 54 publications

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“…The PLD chamber vacuum was 1.7 × 10 −1 Torr during the annealing under the O 2 supply. After the completion of the annealing process, the pure Cu metal layer was converted into the CuO through the oxidation [ 23 ]. The CuO samples are named as CuO-10 s, CuO-20 s, CuO-30 s, CuO-50 s and CuO-0.5A, CuO-1A, CuO-2A, CuO-3A and CuO-5A, respectively, based on the variation of deposition time and current density.…”

Section: Methodsmentioning

confidence: 99%

Hydrogen Peroxide Detection by Super-Porous Hybrid CuO/Pt NP Platform: Improved Sensitivity and Selectivity

et al. 2020

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A super-porous hybrid platform can offer significantly increased number of reaction sites for the analytes and thus can offer advantages in the biosensor applications. In this work, a significantly improved sensitivity and selectivity of hydrogen peroxide (H2O2) detection is demonstrated by a super-porous hybrid CuO/Pt nanoparticle (NP) platform on Si substrate as the first demonstration. The super-porous hybrid platform is fabricated by a physiochemical approach combining the physical vapor deposition of Pt NPs and electrochemical deposition of super-porous CuO structures by adopting a dynamic hydrogen bubble technique. Under an optimized condition, the hybrid CuO/Pt biosensor demonstrates a very high sensitivity of 2,205 µA/mM∙cm2 and a low limit of detection (LOD) of 140 nM with a wide detection range of H2O2. This is meaningfully improved performance as compared to the previously reported CuO-based H2O2 sensors as well as to the other metal oxide-based H2O2 sensors. The hybrid CuO/Pt platform exhibits an excellent selectivity against other interfering molecules such as glucose, fructose, dopamine, sodium chloride and ascorbic acid. Due to the synergetic effect of highly porous CuO structures and underlying Pt NPs, the CuO/Pt architecture offers extremely abundant active sites for the H2O2 reduction and electron transfer pathways.

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Section: Methodsmentioning

confidence: 99%

Hydrogen Peroxide Detection by Super-Porous Hybrid CuO/Pt NP Platform: Improved Sensitivity and Selectivity

et al. 2020

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“…Apart from this, any defect in the structure like pores, cracks, etc may also play a role. During the oxidation process, CuO oxide forms first as Cu is less stable just above 300°C [26][27][28][29][30]. After that, the remaining elements start oxidizing oxidized.…”

Section: Xrd Analysismentioning

confidence: 99%

Oxidation study of CoCrCuFeNiSix high entropy alloys

Shajahan

Kumar

Chopkar

et al. 2020

Mater. Res. Express

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Oxidation studies of Co-Cr-Cu-Fe-Ni-Si X=(0,0.3,0.6,0.9) high entropy alloys (HEA) at 600, 700 and 800°C for 30 h are performed in the present work. Isothermal oxidation confirmed that the oxidation resistance of Co-Cr-Cu-Fe-Ni-Si X=(0,0.3,0.6,0.9 ) high entropy alloy increases with Silicon (Si) content up to 0.6%, beyond that it decreases. Oxidation rate kinetics study of all the alloys at the three designated test temperature represented the typical cubic curve. X-ray diffraction (XRD) analysis revealed the evolution of Cu oxide (CuO) along with existing phases in all the HEA samples. Microstructural observation after oxidation test exhibited an increase in oxide formation with the oxidation temperature. To comprehend the kinetics of oxidation more clearly, Arrhenius plots were drawn for all the HEA samples and activation energies are calculated.

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“…For both reaction schemes, the reduction step can simultaneously occur on the secondary OH‐groups that are oxidized to ketones, while the formed aldehydes can easily be further oxidized to carboxylic acids . The oxidation of the formed Cu 2 O film to a CuO film is kinetically limited by the oxygen diffusion through the thin (∼1 nm) CuO surface oxide layer . The CuO layer is too thin to be detected by the XRD, but it is generally agreed that this layer is always present under ambient conditions …”

Section: Influence Of the Reducing Agentmentioning

confidence: 99%

“…The oxidation of the formed Cu 2 O film to a CuO film is kinetically limited by the oxygen diffusion through the thin (∼1 nm) CuO surface oxide layer . The CuO layer is too thin to be detected by the XRD, but it is generally agreed that this layer is always present under ambient conditions …”

Section: Influence Of the Reducing Agentmentioning

confidence: 99%

“…[50] The oxidation of the formed Cu 2 O film to a CuO film is kinetically limited by the oxygen diffusion through the thin (~1 nm) CuO surface oxide layer. [55,56] The CuO layer is too thin to be detected by the XRD, but it is generally agreed that this layer is always present under ambient conditions. [55][56][57][58] 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57…”

Section: Role Of the Reducing Agent And Choice Of Alternativesmentioning

confidence: 99%

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Aqueous Spray Pyrolysis of Cu₂O Films: Influence of Reducing Agent and Acetic Acid Addition

2020

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Cu2O is attractive as abundant and low‐cost material for energy‐related applications. This study investigated the versatile spray pyrolysis of Cu2O films from aqueous solutions. The appropriate deposition temperature and amount of copper acetate in the sprayed precursor solution was determined in order to eliminate unwanted copper oxide phases. It was shown that the addition of a reducing agent containing primary/secondary OH‐groups with suitable decomposition properties is necessary in order to obtain copper in the +I oxidation state. The influence of the pH value, determined by the addition of acetic acid to solutions containing varying reducing agents, on the structural film properties, was investigated. D‐sorbitol is for the first time proposed as suitable reducing agent to obtain compact and thick (ca. 500 nm) Cu2O films with an optical band gap of 2.3 eV.

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Oxidation mechanism of thin Cu films: A gateway towards the formation of single oxide phase

Cited by 164 publications

References 54 publications

Hydrogen Peroxide Detection by Super-Porous Hybrid CuO/Pt NP Platform: Improved Sensitivity and Selectivity

Hydrogen Peroxide Detection by Super-Porous Hybrid CuO/Pt NP Platform: Improved Sensitivity and Selectivity

Oxidation study of CoCrCuFeNiSix high entropy alloys

Aqueous Spray Pyrolysis of Cu₂O Films: Influence of Reducing Agent and Acetic Acid Addition

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Oxidation mechanism of thin Cu films: A gateway towards the formation of single oxide phase

Cited by 164 publications

References 54 publications

Hydrogen Peroxide Detection by Super-Porous Hybrid CuO/Pt NP Platform: Improved Sensitivity and Selectivity

Hydrogen Peroxide Detection by Super-Porous Hybrid CuO/Pt NP Platform: Improved Sensitivity and Selectivity

Oxidation study of CoCrCuFeNiSix high entropy alloys

Aqueous Spray Pyrolysis of Cu2O Films: Influence of Reducing Agent and Acetic Acid Addition

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Aqueous Spray Pyrolysis of Cu₂O Films: Influence of Reducing Agent and Acetic Acid Addition