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Article ; Online: Investigation of Laser-Induced Graphene (LIG) on a Flexible Substrate and Its Functionalization by Metal Doping for Gas-Sensing Applications.

Kwak, Dongwook / Kim, Hyojin / Jang, Seunghun / Kim, Byoung Gak / Cho, Donghwi / Chang, Hyunju / Lee, Jeong-O

International journal of molecular sciences

2024 Volume 25, Issue 2

Abstract: Graphene materials synthesized using direct laser writing (laser-induced graphene; LIG) make favorable sensor materials because of their large surface area, ease of fabrication, and cost-effectiveness. In particular, LIG decorated with metal ... ...

Abstract	Graphene materials synthesized using direct laser writing (laser-induced graphene; LIG) make favorable sensor materials because of their large surface area, ease of fabrication, and cost-effectiveness. In particular, LIG decorated with metal nanoparticles (NPs) has been used in various sensors, including chemical sensors and electronic and electrochemical biosensors. However, the effect of metal decoration on LIG sensors remains controversial; hypotheses based on computational simulations do not always match the experimental results, and even the experimental results reported by different researchers have not been consistent. In the present study, we explored the effects of metal decorations on LIG gas sensors, with NO
MeSH term(s)	Graphite ; Nitrogen Dioxide ; Electronics ; Gases ; Lasers ; Metals
Chemical Substances	Graphite (7782-42-5) ; Nitrogen Dioxide (S7G510RUBH) ; Gases ; Metals
Language	English
Publishing date	2024-01-18
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2019364-6
ISSN	1422-0067 ; 1422-0067 ; 1661-6596
ISSN (online)	1422-0067
ISSN	1422-0067 ; 1661-6596
DOI	10.3390/ijms25021172
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Electrochemical Transparency of Graphene.

Jeong, Du Won / Kim, Kyuhyoung / Lee, Geonhee / Kang, Minsoung / Chang, Hyunju / Jang, A-Rang / Lee, Jeong-O

ACS nano

2022 Volume 16, Issue 6, Page(s) 9278–9286

Abstract: In the present study, we used the electrochemical transparency of graphene to show that the direct intercalation of alkali-metal cations is not a prerequisite for the redox reaction of Prussian blue (PB). PB thin films passivated with monolayer graphene ... ...

Abstract	In the present study, we used the electrochemical transparency of graphene to show that the direct intercalation of alkali-metal cations is not a prerequisite for the redox reaction of Prussian blue (PB). PB thin films passivated with monolayer graphene still underwent electrochemical redox reactions in the presence of alkali-metal ions (K
Language	English
Publishing date	2022-06-14
Publishing country	United States
Document type	Journal Article
ISSN	1936-086X
ISSN (online)	1936-086X
DOI	10.1021/acsnano.2c01786
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Ultrathin Metal Film on Graphene for Percolation-Threshold-Limited Thermal Emissivity Control.

Lee, Geonhee / Jang, Sojeong / Kim, Young-Bin / Cho, Donghwi / Jeong, Duwon / Chae, Soosang / Myoung, Jae-Min / Kim, Hyunwoo / Kim, Sun-Kyung / Lee, Jeong-O

Advanced materials (Deerfield Beach, Fla.)

2023 Volume 35, Issue 38, Page(s) e2301227

Abstract: Translucent Au/graphene hybrid films are shown to be effective in reducing thermal emission from the underlying surfaces when the deposition thickness of Au is close to the percolation threshold. The critical Au deposition thickness for an abrupt change ... ...

Abstract	Translucent Au/graphene hybrid films are shown to be effective in reducing thermal emission from the underlying surfaces when the deposition thickness of Au is close to the percolation threshold. The critical Au deposition thickness for an abrupt change in emissivity is reduced from 15 nm (Si substrate) to a percolation-threshold-limited thickness of 8.5 nm (graphene/Si substrate) because of the chemical inertness of graphene leading to the deposited Au atoms forming a thin, crystalline layer. The effect of the graphene layer on the optical properties of the hybrid film is highlighted by a drastic increase in infrared absorptivity, whereas the visible absorptivity is marginally affected by the presence of a graphene layer. The level of thermal emission from the Au/graphene hybrid films with the percolation-threshold-limited Au thickness is stable even with high background temperatures of up to 300 °C and mechanical strains of ≈4%. As an example of a thermal management application, an anti-counterfeiting device is demonstrated; thermal-camouflage-masked text fabricated with an Au/graphene hybrid film is discernible only using a thermographic camera. Ultrathin metal film assisted by a graphene layer will provide a facile platform for thermal management with semi-transparency, flexibility, and transferability to arbitrary surfaces.
Language	English
Publishing date	2023-07-21
Publishing country	Germany
Document type	Journal Article
ZDB-ID	1474949-X
ISSN	1521-4095 ; 0935-9648
ISSN (online)	1521-4095
ISSN	0935-9648
DOI	10.1002/adma.202301227
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Article ; Online: Rational design of hybrid sensor arrays combined synergistically with machine learning for rapid response to a hazardous gas leak environment in chemical plants.

Ku, Wonseok / Lee, Geonhee / Lee, Ju-Yeon / Kim, Do-Hyeong / Park, Ki-Hong / Lim, Jongtae / Cho, Donghwi / Ha, Seung-Chul / Jung, Byung-Gil / Hwang, Heesu / Lee, Wooseop / Shin, Huisu / Jang, Ha Seon / Lee, Jeong-O / Hwang, Jin-Ha

Journal of hazardous materials

2024 Volume 466, Page(s) 133649

Abstract: Combinations of semiconductor metal oxide (SMO) sensors, electrochemical (EC) sensors, and photoionization detection (PID) sensors were used to discriminate chemical hazards on the basis of machine learning. Sensing data inputs were exploited in the form ...

Abstract	Combinations of semiconductor metal oxide (SMO) sensors, electrochemical (EC) sensors, and photoionization detection (PID) sensors were used to discriminate chemical hazards on the basis of machine learning. Sensing data inputs were exploited in the form of either numerical or image data formats, and the classification of chemical hazards with high accuracy was achieved in both cases. Even a small amount of gas sensing or purging data (input for ∼30 s) input can be exploited in machine-learning-based gas discrimination. SMO sensors exhibit high performance even in a single-sensor mode, presumably because of the intrinsic cross-sensitivity of metal oxides, which is otherwise considered a major disadvantage of SMO sensors. EC sensors were enhanced through synergistic integration of sensor combinations with machine learning. For precision detection of multiple target analytes, a minimum number of sensors can be proposed for gas detection/discrimination by combining sensors with dissimilar operating principles. The Type I hybrid sensor combines one SMO sensor, one EC sensor, and one PID sensor and is used to identify NH
Language	English
Publishing date	2024-01-28
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	1491302-1
ISSN	1873-3336 ; 0304-3894
ISSN (online)	1873-3336
ISSN	0304-3894
DOI	10.1016/j.jhazmat.2024.133649
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Article ; Online: Unusual Raman Enhancement Effect of Ultrathin Copper Sulfide.

Kim, Gwangwoo / Jeong, Du Won / Lee, Geonhee / Lee, Suok / Ma, Kyung Yeol / Hwang, Hyuntae / Jang, Seunghun / Hong, John / Pak, Sangyeon / Cha, SeungNam / Cho, Donghwi / Kim, Sunkyu / Lim, Jongchul / Lee, Young-Woo / Shin, Hyeon Suk / Jang, A-Rang / Lee, Jeong-O

Small (Weinheim an der Bergstrasse, Germany)

2023 Volume 20, Issue 9, Page(s) e2306819

Abstract: In surface-enhanced Raman spectroscopy (SERS), 2D materials are explored as substrates owing to their chemical stability and reproducibility. However, they exhibit lower enhancement factors (EFs) compared to noble metal-based SERS substrates. This study ... ...

Abstract	In surface-enhanced Raman spectroscopy (SERS), 2D materials are explored as substrates owing to their chemical stability and reproducibility. However, they exhibit lower enhancement factors (EFs) compared to noble metal-based SERS substrates. This study demonstrates the application of ultrathin covellite copper sulfide (CuS) as a cost-effective SERS substrate with a high EF value of 7.2 × 10
Language	English
Publishing date	2023-12-28
Publishing country	Germany
Document type	Journal Article
ZDB-ID	2168935-0
ISSN	1613-6829 ; 1613-6810
ISSN (online)	1613-6829
ISSN	1613-6810
DOI	10.1002/smll.202306819
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Article ; Online: Tunneling Spectroscopy for Electronic Bands in Multi-Walled Carbon Nanotubes with Van Der Waals Gap.

Choi, Dong-Hwan / Lee, Seung Mi / Jeong, Du-Won / Lee, Jeong-O / Ha, Dong Han / Bae, Myung-Ho / Kim, Ju-Jin

Molecules (Basel, Switzerland)

2021 Volume 26, Issue 8

Abstract: Various intriguing quantum transport measurements for carbon nanotubes (CNTs) based on their unique electronic band structures have been performed adopting a field-effect transistor (FET), where the contact resistance represents the interaction between ... ...

Abstract	Various intriguing quantum transport measurements for carbon nanotubes (CNTs) based on their unique electronic band structures have been performed adopting a field-effect transistor (FET), where the contact resistance represents the interaction between the one-dimensional and three-dimensional systems. Recently, van der Waals (vdW) gap tunneling spectroscopy for single-walled CNTs with indium-metal contacts was performed adopting an FET device, providing the direct assignment of the subband location in terms of the current-voltage characteristic. Here, we extend the vdW gap tunneling spectroscopy to multi-walled CNTs, which provides transport spectroscopy in a tunneling regime of ~1 eV, directly reflecting the electronic density of states. This new quantum transport regime may allow the development of novel quantum devices by selective electron (or hole) injection to specific subbands.
Language	English
Publishing date	2021-04-07
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	1413402-0
ISSN	1420-3049 ; 1431-5165 ; 1420-3049
ISSN (online)	1420-3049
ISSN	1431-5165 ; 1420-3049
DOI	10.3390/molecules26082128
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Article: Ultrasensitive biosensing platform for

Seo, Giwan / Lee, Geonhee / Kim, Wooyoung / An, Inyoung / Choi, Myungwoo / Jang, Sojeong / Park, Yeon-Joon / Lee, Jeong-O / Cho, Donghwi / Park, Edmond Changkyun

Frontiers in bioengineering and biotechnology

2023 Volume 11, Page(s) 1313494

Abstract: Tuberculosis (TB) has high morbidity as a chronic infectious disease transmitted mainly through the respiratory tract. However, the conventional diagnosis methods for TB are time-consuming and require specialists, making the diagnosis of TB with point-of- ...

Abstract	Tuberculosis (TB) has high morbidity as a chronic infectious disease transmitted mainly through the respiratory tract. However, the conventional diagnosis methods for TB are time-consuming and require specialists, making the diagnosis of TB with point-of-care (POC) detection difficult. Here, we developed a graphene-based field-effect transistor (GFET) biosensor for detecting the MPT64 protein of
Language	English
Publishing date	2023-12-20
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2719493-0
ISSN	2296-4185
ISSN	2296-4185
DOI	10.3389/fbioe.2023.1313494
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Article ; Online: Multifunctional-high resolution imaging plate based on hydrophilic graphene for digital pathology.

Lee, Geonhee / Oh, Yuna / Nam, Jung Tae / Ji, Seulgi / Jang, A-Rang / Jeong, Du Won / Kang, MinSoung / Lee, Sun Sook / Chae, Soosang / Cho, Donghwi / Hwang, Jun Yeon / Lee, Kyungeun / Lee, Jeong-O

Nanotechnology

2022 Volume 33, Issue 50

Abstract: In the present study, we showed that hydrophilic graphene can serve as an ideal imaging plate for biological specimens. Graphene being a single-atom-thick semi-metal with low secondary electron emission, array tomography analysis of serial sections of ... ...

Abstract	In the present study, we showed that hydrophilic graphene can serve as an ideal imaging plate for biological specimens. Graphene being a single-atom-thick semi-metal with low secondary electron emission, array tomography analysis of serial sections of biological specimens on a graphene substrate showed excellent image quality with improved
MeSH term(s)	Dimethylpolysiloxanes ; Graphite ; Microscopy, Electron, Scanning ; Optical Imaging ; Oxygen
Chemical Substances	Dimethylpolysiloxanes ; Graphite (7782-42-5) ; Oxygen (S88TT14065)
Language	English
Publishing date	2022-10-03
Publishing country	England
Document type	Journal Article
ZDB-ID	1362365-5
ISSN	1361-6528 ; 0957-4484
ISSN (online)	1361-6528
ISSN	0957-4484
DOI	10.1088/1361-6528/ac9143
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Article ; Online: 3D-printed origami electronics using percolative conductors.

Jo, Yejin / Jeong, Du Won / Lee, Jeong-O / Choi, Youngmin / Jeong, Sunho

RSC advances

2018 Volume 8, Issue 40, Page(s) 22755–22762

Abstract: Recently, three-dimensional (3D) printing has garnered tremendous amounts of attention in various applications. In this study, we suggest a facile means of creating 3D-printed foldable electrodes on ... ...

Abstract	Recently, three-dimensional (3D) printing has garnered tremendous amounts of attention in various applications. In this study, we suggest a facile means of creating 3D-printed foldable electrodes on paper
Language	English
Publishing date	2018-06-20
Publishing country	England
Document type	Journal Article
ISSN	2046-2069
ISSN (online)	2046-2069
DOI	10.1039/c8ra04082f
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Article ; Online: Fabrication of Carbon Nanomaterials Using Laser Scribing on Copper Nanoparticles-Embedded Polyacrylonitrile Films and Their Application in a Gas Sensor

Yong-il Ko / Min-Jae Kim / Dong-Yun Lee / Jungtae Nam / A-Rang Jang / Jeong-O Lee / Keun-Soo Kim

Polymers, Vol 13, Iss 1423, p

2021 Volume 1423

Abstract: Carbon nanomaterials have attracted significant research attention as core materials in various industrial sectors owing to their excellent physicochemical properties. However, because the preparation of carbon materials is generally accompanied by high- ... ...

Abstract	Carbon nanomaterials have attracted significant research attention as core materials in various industrial sectors owing to their excellent physicochemical properties. However, because the preparation of carbon materials is generally accompanied by high-temperature heat treatment, it has disadvantages in terms of cost and process. In this study, highly sensitive carbon nanomaterials were synthesized using a local laser scribing method from a copper-embedded polyacrylonitrile (CuPAN) composite film with a short processing time and low cost. The spin-coated CuPAN was converted into a carbonization precursor through stabilization and then patterned into a carbon nanomaterial of the desired shape using a pulsed laser. In particular, the stabilization process was essential in laser-induced carbonization, and the addition of copper promoted this effect as a catalyst. The synthesized material had a porous 3D structure that was easy to detect gas, and the resistance responses were detected as −2.41 and +0.97% by exposure to NO 2 and NH 3 , respectively. In addition, the fabricated gas sensor consists of carbon materials and quartz with excellent thermal stability; therefore, it is expected to operate as a gas sensor even in extreme environments.
Keywords	carbon nanomaterials ; laser scribing ; gas sensor ; polyacrylonitrile ; stabilization ; copper particles ; Organic chemistry ; QD241-441
Subject code	660 ; 620
Language	English
Publishing date	2021-04-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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