Effect of pH at Early Formed Structures in Cobalt Electrodeposition

Ali, Sahari; Salim, Mokhtari

doi:10.14233/ajchem.2013.11031

Cited by 6 publications

(4 citation statements)

References 18 publications

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“…catalyzed the oxidationo fa lcohol, [13] and copperm anganese oxide nanoparticles have been used for the oxidation of carbon monoxide, [14] alcohols, [15] and various hydrocarbons. [14,16] Similarly,M MOs containing manganese oxide along with those that are noble-metal doped/supported [16i, 17] are also used for the oxidation of benzyl alcohol.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Comparative Catalytic Study of Zirconia-MnCO₃or -Mn₂O₃for the Oxidation of Benzylic Alcohols

et al. 2016

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We report on the synthesis of the zirconia–manganese carbonate ZrO x (x %)–MnCO3 catalyst (where x=1–7) that, upon calcination at 500 °C, is converted to zirconia–manganese oxide ZrO x (x %)–Mn2O3. We also present a comparative study of the catalytic performance of the both catalysts for the oxidation of benzylic alcohol to corresponding aldehydes by using molecular oxygen as the oxidizing agent. ZrO x (x %)–MnCO3 was prepared through co‐precipitation by varying the amounts of Zr(NO3)4 (w/w %) in Mn(NO3)2. The morphology, composition, and crystallinity of the as‐synthesized product and the catalysts prepared upon calcination were studied by using scanning electron microscopy, transmission electron microscopy, energy‐dispersive X‐ray spectroscopy, and powder X‐ray diffraction. The surface areas of the catalysts [133.58 m2 g−1 for ZrO x (1 %)–MnCO3 and 17.48 m2 g−1 for ZrO x (1 %)–Mn2O3] were determined by using the Brunauer–Emmett–Teller method, and the thermal stability was assessed by using thermal gravimetric analysis. The catalyst with composition ZrO x (1 %)–MnCO3 pre‐calcined at 300 °C exhibited excellent specific activity (48.00 mmolg−1 h−1) with complete conversion within approximately 5 min and catalyst cyclability up to six times without any significant loss in activity. The specific activity, turnover number and turnover frequency achieved is the highest so far (to the best of our knowledge) compared to the previously reported catalysts used for the oxidation of benzyl alcohol. The catalyst showed selectivity for aromatic alcohols over aliphatic alcohols.

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Section: Introductionmentioning

confidence: 99%

Synthesis and Comparative Catalytic Study of Zirconia-MnCO₃or -Mn₂O₃for the Oxidation of Benzylic Alcohols

et al. 2016

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“…The combination was subjected to electrodeposition of CoNPs from a solution of 0.1 M CoCl 2 , 1 M NaCl, and 0.5 M H 3 BO 3 (pH = 4) using cyclic voltammetry (CV) employing a potentiostat with a voltage scan window between 0.5 and −1.5 V for five cycles at a scan rate 20 mV/s. 36 The mask was removed from the electrode setup after deposition of the Co−MoS x material on Cu. The RE and CE were coated with Ag/AgCl ink and Ag ink, respectively, as they exhibit excellent temperature sensitivity.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

“…The connecting wire was soldered to the wire-connecting pad of the MoS x -coated WE. The combination was subjected to electrodeposition of CoNPs from a solution of 0.1 M CoCl 2 , 1 M NaCl, and 0.5 M H 3 BO 3 (pH = 4) using cyclic voltammetry (CV) employing a potentiostat with a voltage scan window between 0.5 and −1.5 V for five cycles at a scan rate 20 mV/s . The mask was removed from the electrode setup after deposition of the Co–MoS x material on Cu.…”

Section: Methodsmentioning

confidence: 99%

Efficient Point-of-Care Detection of Uric Acid in the Human Blood Sample with an Enhanced Electrocatalytic Response Using Nanocomposites of Cobalt and Mixed-Valent Molybdenum Sulfide

Roy

Biswas

Halder

et al. 2022

ACS Appl. Bio Mater.

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This work efficiently detects uric acid (UA) in a human blood sample using cobalt nanoparticle-immobilized mixed-valent molybdenum sulfide on the copper substrate in a point-of-care (PoC) device. The sensor electrode was fabricated by micromachining of Cu clad boards employing an engraver to generate a three-electrode system consisting of working electrode (WE), reference electrode (RE), and counter electrode (CE). The WE was subjected to physical vapor deposition of mixed-valent MoS x layers by a reaction between Mo(CO) 6 and H 2 S at ∼200 °C using a simple setup following which CoNPs were electrochemically deposited. The RE and CE were covered with Ag/AgCl and Ag paste, respectively. A plasma separation membrane acted as the medium of UA/blood serum delivery to the electrodes. The material and electrochemical characterization confirmed that CoNPs over MoS x provided an enlarged electroactive surface for the direct electron transfer to achieve an enhanced electrocatalytic response. The binary combination of CoNPs and MoS x layers over the Cu electrode reduced the charge-transfer resistance by two times, enhanced the surface adsorption by more than two times, and yielded a high diffusion coefficient of 3.46 × 10 −3 cm 2 /s. These interfacial effects facilitated the UA oxidation, leading to unprecedented mA range current density for UA sensing for the PoC device. The electrochemical detection tests in the PoC device revealed a sensitivity of 64.7 μA/μM cm −2 , which is ∼50 times higher compared to the latest reported value (1.23 μA/μM cm −2 ), a high limit of detection of 5 nM, and shelf life of 6 months, confirming the synergistic effect-mediated high sensitivity under PoC settings. Interference tests confirmed no intervention of similar analytes. Tests on blood samples demonstrated a recovery percentage close to 100% in human serum UA, signifying the suitability of the nanocompositebased sensor and the PoC device for clinical sensing applications.

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“…Therefore, previous researches on cobalt electrodeposition mainly focused on the cobalt structure, shape control, and deposition mechanism for the cobalt film on the plane substrate. [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] In contrast, in patterned areas such as interconnects, the purpose of the study is completely different, and research on the electrodeposition for feature filling using cobalt is insufficient.…”

mentioning

confidence: 99%

Proton Sensitive Additive for Cobalt Electrodeposition

Kang

Sung

Byun

et al. 2020

J. Electrochem. Soc.

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Cobalt electrodeposition involves hydrogen reduction reaction, and the proton supply in feature filling varies depending on the location because of the topographical characteristics, thereby resulting in changes on the electrode surface, such as changes in pH and hydrogen adsorption. Based on this phenomenon, void-free trench filling was performed using benzimidazole (BZI) as an additive, which has different suppression effects depending on pH. Linear sweep voltammetry experiments confirmed the change in suppression behavior of the additive according to pH. Chronoamperometric transients were performed at a fixed BZI concentration to confirm the potential region, wherein actual cobalt deposition was suppressed. Chronoamperometric analysis with various rotation rates was also conducted to demonstrate the effect of proton concentration near the electrode on the suppression effect of BZI. Finally, a void-free filling working mechanism in a low aspect ratio trench using BZI was proposed. This study proposes, a single additive, whose suppression behavior changes according to the change in pH of the electrode surface, by considering the pH of the cobalt deposition solution and pK a value of the additive. Furthermore, it was demonstrated that void-free filling can be performed even in a trench with a low aspect ratio.

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Effect of pH at Early Formed Structures in Cobalt Electrodeposition

Cited by 6 publications

References 18 publications

Synthesis and Comparative Catalytic Study of Zirconia-MnCO₃or -Mn₂O₃for the Oxidation of Benzylic Alcohols

Synthesis and Comparative Catalytic Study of Zirconia-MnCO₃or -Mn₂O₃for the Oxidation of Benzylic Alcohols

Efficient Point-of-Care Detection of Uric Acid in the Human Blood Sample with an Enhanced Electrocatalytic Response Using Nanocomposites of Cobalt and Mixed-Valent Molybdenum Sulfide

Proton Sensitive Additive for Cobalt Electrodeposition

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Effect of pH at Early Formed Structures in Cobalt Electrodeposition

Cited by 6 publications

References 18 publications

Synthesis and Comparative Catalytic Study of Zirconia-MnCO3or -Mn2O3for the Oxidation of Benzylic Alcohols

Synthesis and Comparative Catalytic Study of Zirconia-MnCO3or -Mn2O3for the Oxidation of Benzylic Alcohols

Efficient Point-of-Care Detection of Uric Acid in the Human Blood Sample with an Enhanced Electrocatalytic Response Using Nanocomposites of Cobalt and Mixed-Valent Molybdenum Sulfide

Proton Sensitive Additive for Cobalt Electrodeposition

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Synthesis and Comparative Catalytic Study of Zirconia-MnCO₃or -Mn₂O₃for the Oxidation of Benzylic Alcohols

Synthesis and Comparative Catalytic Study of Zirconia-MnCO₃or -Mn₂O₃for the Oxidation of Benzylic Alcohols