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Kubota W, Utsunomiya T, Ichii T, Sugimura H. Chemical Etching of Silicon Assisted by Graphene Oxide in an HF-HNO 3 Solution and Its Catalytic Mechanism. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:9920-9926. [PMID: 34351164 DOI: 10.1021/acs.langmuir.1c01681] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Chemical etching of silicon assisted by various types of carbon materials is drawing much attention for the fabrication of silicon micro/nanostructures. We developed a method of chemical etching of silicon that utilizes graphene oxide (GO) sheets to promote the etching reaction in a hydrofluoric acid-nitric acid (HF-HNO3) etchant. By using an optimized composition of the HF-HNO3 etchant, the etching rate under the GO sheets was 100 times faster than that of our HF-H2O2 system used in a previous report. Kinetic analyses showed that the activation energy of the etching reaction was almost the same at both the bare silicon and GO-covered areas. We propose that adsorption sites for the reactant in the GO sheets enhance the reaction frequency, leading to a deeper etching in the GO areas than the bare areas. Furthermore, GO sheets with more defects were found to have higher catalytic activities. This suggests that defects in the GO sheets function as adsorption sites for the reactant, thereby enhancing the etching rate under the sheets.
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Affiliation(s)
- Wataru Kubota
- Department of Materials Science and Engineering, Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan
| | - Toru Utsunomiya
- Department of Materials Science and Engineering, Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan
| | - Takashi Ichii
- Department of Materials Science and Engineering, Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan
| | - Hiroyuki Sugimura
- Department of Materials Science and Engineering, Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan
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Sapner VS, Chavan PP, Digraskar RV, Narwade SS, Mulik BB, Mali SM, Sathe BR. Tyramine Functionalized Graphene: Metal-Free Electrochemical Non-Enzymatic Biosensing of Hydrogen Peroxide. ChemElectroChem 2018. [DOI: 10.1002/celc.201801083] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Vijay S. Sapner
- Department of Chemistry; Dr. Babasaheb Ambedkar Marathwada University; Aurangabad (MH) 431004 India
| | - Parag P. Chavan
- Department of Chemistry; Dr. Babasaheb Ambedkar Marathwada University; Aurangabad (MH) 431004 India
| | - Renuka V. Digraskar
- Department of Chemistry; Dr. Babasaheb Ambedkar Marathwada University; Aurangabad (MH) 431004 India
| | - Shankar S. Narwade
- Department of Chemistry; Dr. Babasaheb Ambedkar Marathwada University; Aurangabad (MH) 431004 India
| | - Balaji B. Mulik
- Department of Chemistry; Dr. Babasaheb Ambedkar Marathwada University; Aurangabad (MH) 431004 India
| | - Shivsharan M. Mali
- Department of Chemistry; Dr. Babasaheb Ambedkar Marathwada University; Aurangabad (MH) 431004 India
| | - Bhaskar R. Sathe
- Department of Chemistry; Dr. Babasaheb Ambedkar Marathwada University; Aurangabad (MH) 431004 India
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Kitte SA, Zafar MN, Zholudov YT, Ma X, Nsabimana A, Zhang W, Xu G. Determination of Concentrated Hydrogen Peroxide Free from Oxygen Interference at Stainless Steel Electrode. Anal Chem 2018; 90:8680-8685. [PMID: 29923395 DOI: 10.1021/acs.analchem.8b02038] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
H2O2 is frequently used at high concentrations in various applications. It is very challenging to detect high concentrations of H2O2 and to eliminate oxygen interference for H2O2 detection through electrochemical reduction. In the present investigation, the electrochemistry of H2O2 at stainless steel electrode has been carried out for the first time. A cathodic peak for H2O2 reduction was observed at about -0.40 V, and no cathodic peak for dissolved oxygen reduction was observed on type 304 stainless steel electrode. Amperometric determination of H2O2 on type 304 stainless steel electrode displayed a linear range from 0.05 up to 733 mM with a detection limit of 0.02 mM (S/N = 3) and a sensitivity of 16.7 μA mM-1 cm-2. The type 304 stainless steel electrode not only shows much higher upper limit than other reported electrodes for the detection of concentrated H2O2 but also is free from oxygen interference, which is of great importance for practical applications. This method could detect H2O2 in wound wash and lake water with excellent recoveries. Moreover, we successfully applied the stainless steel electrode to determine glucose using glucose oxidase to catalyze the oxidation of glucose to generate hydrogen peroxide. The linear range for glucose is between 0.5 and 25 mM, which covers clinically important blood glucose concentrations well.
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Affiliation(s)
- Shimeles Addisu Kitte
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry , Chinese Academy of Sciences , 5625 Renmin Street , Changchun , Jilin 130022 , P.R. China.,University of Chinese Academy of Sciences , Beijing , 100049 , P.R. China.,Department of Chemistry, College of Natural Sciences , Jimma University , P.O. Box 378, Jimma , Ethiopia
| | - Muhammad Nadeem Zafar
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry , Chinese Academy of Sciences , 5625 Renmin Street , Changchun , Jilin 130022 , P.R. China.,Department of Chemistry , University of Gujrat , Gujrat , Punjab 50700 Pakistan
| | - Yuriy T Zholudov
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry , Chinese Academy of Sciences , 5625 Renmin Street , Changchun , Jilin 130022 , P.R. China.,Laboratory of Analytical Optochemotronics , Kharkiv National University of Radio Electronics , 14 Nauka Ave. , Kharkiv , 61166 , Ukraine
| | - Xiangui Ma
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry , Chinese Academy of Sciences , 5625 Renmin Street , Changchun , Jilin 130022 , P.R. China.,University of Chinese Academy of Sciences , Beijing , 100049 , P.R. China
| | - Anaclet Nsabimana
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry , Chinese Academy of Sciences , 5625 Renmin Street , Changchun , Jilin 130022 , P.R. China.,University of Chinese Academy of Sciences , Beijing , 100049 , P.R. China
| | - Wei Zhang
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry , Chinese Academy of Sciences , 5625 Renmin Street , Changchun , Jilin 130022 , P.R. China
| | - Guobao Xu
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry , Chinese Academy of Sciences , 5625 Renmin Street , Changchun , Jilin 130022 , P.R. China
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