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Jang DJ, Haidari MM, Kim JH, Ko JY, Yi Y, Choi JS. A Modified Wet Transfer Method for Eliminating Interfacial Impurities in Graphene. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:nano13091494. [PMID: 37177039 PMCID: PMC10179892 DOI: 10.3390/nano13091494] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2023] [Revised: 04/25/2023] [Accepted: 04/25/2023] [Indexed: 05/15/2023]
Abstract
Graphene has immense potential as a material for electronic devices owing to its unique electrical properties. However, large-area graphene produced by chemical vapor deposition (CVD) must be transferred from the as-grown copper substrate to an arbitrary substrate for device fabrication. The conventional wet transfer technique, which uses FeCl3 as a Cu etchant, leaves microscale impurities from the substrate, and the etchant adheres to graphene, thereby degrading its electrical performance. To address this limitation, this study introduces a modified transfer process that utilizes a temporary UV-treated SiO2 substrate to adsorb impurities from graphene before transferring it onto the final substrate. Optical microscopy and Raman mapping confirmed the adhesion of impurities to the temporary substrate, leading to a clean graphene/substrate interface. The retransferred graphene shows a reduction in electron-hole asymmetry and sheet resistance compared to conventionally transferred graphene, as confirmed by the transmission line model (TLM) and Hall effect measurements (HEMs). These results indicate that only the substrate effects remain in action in the retransferred graphene, and most of the effects of the impurities are eliminated. Overall, the modified transfer process is a promising method for obtaining high-quality graphene suitable for industrial-scale utilization in electronic devices.
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Affiliation(s)
- Dong Jin Jang
- Department of Physics, Konkuk University, Seoul 05029, Republic of Korea
| | | | - Jin Hong Kim
- Department of Physics, Konkuk University, Seoul 05029, Republic of Korea
| | - Jin-Yong Ko
- Department of Physics, Konkuk University, Seoul 05029, Republic of Korea
| | - Yoonsik Yi
- Superintelligent Creative Research Laboratory, Electronics and Telecommunication Research Institute (ETRI), Daejeon 34129, Republic of Korea
| | - Jin Sik Choi
- Department of Physics, Konkuk University, Seoul 05029, Republic of Korea
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Li L, Zhou L, Hu Z, Li T, Chen B, Li HY, Liu H. Hollow-Out Fe 2O 3-Loaded NiO Heterojunction Nanorods Enable Real-Time Exhaled Ethanol Monitoring under High Humidity. ACS APPLIED MATERIALS & INTERFACES 2023; 15:15707-15720. [PMID: 36924356 DOI: 10.1021/acsami.2c23088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
The analysis of exhaled breath has opened up new exciting avenues in medical diagnostics, sleep monitoring, and drunk driving detection. Nevertheless, the detection accuracy is greatly affected due to high humidity in the exhaled breath. Here, we propose a regulation method to solve the problem of humidity adaptability in the ethanol-monitoring process by building a heterojunction and hollow-out nanostructure. Therefore, large specific surface area hollow-out Fe2O3-loaded NiO heterojunction nanorods assembled by porous ultrathin nanosheets were prepared by a well-tailored interface reaction. The excellent response (51.2 toward 10 ppm ethanol at 80% relative humidity) and selectivity to ethanol under high relative humidity with a lower operating temperature (150 °C) were obtained, and the detection limit was as low as 0.5 ppb with excellent long-term stability. The superior gas-sensing performance was attributed to the high surface activity of the heterojunction and hollow-out nanostructure. More importantly, GC-MS, diffuse reflectance Fourier transform infrared spectroscopy, and DFT were utilized to analyze the mechanisms of heterojunction sensitization, ethanol-sensing reaction, and high-humidity adaptability. Our integrated low-power MEMS Internet of Things (IoT) system based on Fe2O3@NiO successfully demonstrates the functional verification of ethanol detection in human exhalation, and the integrated voice alarm and IoT positioning functions are expected to solve the problem of real-time monitoring and rapid initial screening of drunk driving. Overall, this novel method plays a vital role in areas such as control of material morphology and composition, breath analysis, gas-sensing mechanism research, and artificial olfaction.
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Affiliation(s)
- Long Li
- School of Integrated Circuits, School of Optical and Electronic Information, Wuhan National Laboratory for Optoelectronics, Optics Valley Laboratory, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan, Hubei 430074, P. R. China
| | - Licheng Zhou
- School of Integrated Circuits, School of Optical and Electronic Information, Wuhan National Laboratory for Optoelectronics, Optics Valley Laboratory, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan, Hubei 430074, P. R. China
| | - Zhixiang Hu
- School of Integrated Circuits, School of Optical and Electronic Information, Wuhan National Laboratory for Optoelectronics, Optics Valley Laboratory, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan, Hubei 430074, P. R. China
| | - Tiankun Li
- Wenzhou Advanced Manufacturing Institute, Huazhong University of Science and Technology, 1085 Meiquan Road, Wenzhou, Zhejiang 325035, P. R. China
| | - Bingbing Chen
- School of Energy Science and Engineering, Nanjing Tech University, Nanjing, Jiangsu, 211816, P. R. China
| | - Hua-Yao Li
- School of Integrated Circuits, School of Optical and Electronic Information, Wuhan National Laboratory for Optoelectronics, Optics Valley Laboratory, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan, Hubei 430074, P. R. China
- Wenzhou Advanced Manufacturing Institute, Huazhong University of Science and Technology, 1085 Meiquan Road, Wenzhou, Zhejiang 325035, P. R. China
| | - Huan Liu
- School of Integrated Circuits, School of Optical and Electronic Information, Wuhan National Laboratory for Optoelectronics, Optics Valley Laboratory, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan, Hubei 430074, P. R. China
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Amani‐Ghadim AR, Tarighati Sareshkeh A, Nozad Ashan N, Mohseni‐Zonouz H, Seyed Ahmadian SM, Seyed Dorraji MS, Gholinejad M, Bayat F. Photocatalytic activity enhancement of carbon‐doped
g‐C
3
N
4
by synthesis of nanocomposite with
Ag
2
O
and
α‐Fe
2
O
3
. J CHIN CHEM SOC-TAIP 2021. [DOI: 10.1002/jccs.202100253] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ali Reza Amani‐Ghadim
- Applied Chemistry Research Laboratory, Department of Chemistry, Faculty of Sciences Azarbaijan Shahid Madani University Tabriz Iran
| | | | - Narges Nozad Ashan
- Office of Management Development and Research, East Azarbaijan's Water and Wastewater Company Tabriz Iran
| | - Homa Mohseni‐Zonouz
- Physical Chemistry Laboratory, Department of Chemistry, Faculty of Sciences Azarbaijan Shahid Madani University Tabriz Iran
| | - Seyed Masoud Seyed Ahmadian
- Physical Chemistry Laboratory, Department of Chemistry, Faculty of Sciences Azarbaijan Shahid Madani University Tabriz Iran
| | - Mir Saeed Seyed Dorraji
- Applied Chemistry Research Laboratory, Department of Chemistry, Faculty of Science University of Zanjan Zanjan Iran
| | - Mohammad Gholinejad
- Department of Chemistry Institute for Advanced Studies in Basic Sciences (IASBS) Zanjan Iran
- Research Center for Basic Sciences & Modern Technologies (RBST), Institute for Advanced Studies in Basic Sciences (IASBS) Zanjan Iran
| | - Farzaneh Bayat
- Department of Physics, Faculty of Sciences Azarbaijan Shahid Madani University Tabriz Iran
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Kuchma E, Kubrin S, Soldatov A. The Local Atomic Structure of Colloidal Superparamagnetic Iron Oxide Nanoparticles for Theranostics in Oncology. Biomedicines 2018; 6:biomedicines6030078. [PMID: 30021987 PMCID: PMC6163922 DOI: 10.3390/biomedicines6030078] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Revised: 07/12/2018] [Accepted: 07/15/2018] [Indexed: 12/21/2022] Open
Abstract
The paper contains an overview of modern spectroscopic methods for studying the local atomic structure of superparamagnetic nanoparticles based on iron oxide (SPIONs), which are an important class of materials promising for theranostics in oncology. Practically important properties of small and ultra small nanoparticles are determined primarily by their shape, size, and features of the local atomic, electronic, and magnetic structures, for the study of which the standard characterization methods developed for macroscopic materials are not optimal. The paper analyzes results of the studies of SPIONs local atomic structure carried out by X-ray absorption spectroscopy at synchrotron radiation sources and Mössbauer spectroscopy during the last decade.
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Affiliation(s)
- Elena Kuchma
- Smart Materials Research Center, Southern Federal University of Russia, 344006 Rostov-on-Don, Russia.
| | - Stanislav Kubrin
- Smart Materials Research Center, Southern Federal University of Russia, 344006 Rostov-on-Don, Russia.
- Research Institute of Physics, Southern Federal University of Russia, 344006 Rostov-on-Don, Russia.
| | - Alexander Soldatov
- Smart Materials Research Center, Southern Federal University of Russia, 344006 Rostov-on-Don, Russia.
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