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  1. Article ; Online: Growth of twisted bilayer graphene through two-stage chemical vapor deposition.

    Chu, Che-Men / Woon, Wei-Yen

    Nanotechnology

    2020  Volume 31, Issue 43, Page(s) 435603

    Abstract: We investigate growth of twisted bilayer graphene through two-stage chemical vapor deposition (CVD). Exploiting the synergetic nucleation and growth dynamics involving carbon sources from the residual carbon impurities in Cu bulk and gaseous ... ...

    Abstract We investigate growth of twisted bilayer graphene through two-stage chemical vapor deposition (CVD). Exploiting the synergetic nucleation and growth dynamics involving carbon sources from the residual carbon impurities in Cu bulk and gaseous CH
    Language English
    Publishing date 2020-07-07
    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/aba39e
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: The First-Water-Layer Evolution at the Graphene/Water Interface under Different Electro-Modulated Hydrophilic Conditions Observed by Suspended/Supported Field-Effect-Device Architectures.

    Tsai, Ming-Hsiu / Lu, Yu-Xuan / Lin, Cheng-Yu / Lin, Chun-Hsuan / Wang, Chien-Chun / Chu, Che-Men / Woon, Wei-Yen / Lin, Chih-Ting

    ACS applied materials & interfaces

    2023  Volume 15, Issue 13, Page(s) 17019–17028

    Abstract: Interfacial water molecules affect carrier transportation within graphene and related applications. Without proper tools, however, most of the previous works focus on simulation modeling rather than experimental validation. To overcome this obstacle, a ... ...

    Abstract Interfacial water molecules affect carrier transportation within graphene and related applications. Without proper tools, however, most of the previous works focus on simulation modeling rather than experimental validation. To overcome this obstacle, a series of graphene field-effect transistors (GFETs) with suspended (substrate-free, SF) and supported (oxide-supported, OS) configurations are developed to investigate the graphene-water interface under different hydrophilic conditions. With deionized water environments, in our experiments, the electrical transportation behaviors of the graphene mainly originate from the evolution of the interfacial water-molecule arrangement. Also, these current-voltage behaviors can be used to elucidate the first-water layer at the graphene-water interface. For SF-GFET, our experimental results show positive hysteresis in electrical transportation. These imply highly ordered interfacial water molecules with a separated-ionic distributed structure. For OS-GFET, on the contrary, the negative hysteresis shows the formation of the hydrogen-bond interaction between the interfacial water layer and the SiO
    Language English
    Publishing date 2023-03-22
    Publishing country United States
    Document type Journal Article
    ISSN 1944-8252
    ISSN (online) 1944-8252
    DOI 10.1021/acsami.3c00037
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Correction to "Variations in the Effective Work Function of Graphene in a Sliding Electrical Contact Interface under Ambient Conditions".

    Huang, Shuei-De / Chu, En-De / Wang, Yu-Han / Liou, Jhe-Wei / Wang, Ruei-Si / Woon, Wei-Yen / Chiu, Hsiang-Chih

    ACS applied materials & interfaces

    2023  Volume 15, Issue 8, Page(s) 11390

    Language English
    Publishing date 2023-02-15
    Publishing country United States
    Document type Published Erratum
    ISSN 1944-8252
    ISSN (online) 1944-8252
    DOI 10.1021/acsami.3c01511
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Revisiting Oxidation Scanning Probe Lithography of Graphene: Balance of Water Condensation Energy and Electrostatic Energy

    Liou, Jhe-Wei / Woon, Wei-Yen

    Journal of physical chemistry. 2019 Sept. 23, v. 123, no. 41

    2019  

    Abstract: We present a study on oxidation scanning probe lithography (o-SPL) of chemical vapor deposition grown graphene conducted under a pulsed voltage bias (Vbᵢₐₛ) with millisecond rise time. It is found that the o-SPL patterns are circular ring-like trenches. ... ...

    Abstract We present a study on oxidation scanning probe lithography (o-SPL) of chemical vapor deposition grown graphene conducted under a pulsed voltage bias (Vbᵢₐₛ) with millisecond rise time. It is found that the o-SPL patterns are circular ring-like trenches. The size of the ring-like trenches increase as the Vbᵢₐₛ and relative humidity increase. Combining detailed analysis and numerical calculation, it is concluded that the balance between water condensation energy and electrostatic energy is the deterministic factor that define the shape and boundary of the water meniscus, within which the o-SPL process takes place. The oxidation process starts over a common threshold Vbᵢₐₛ and stops at the outer edge of the water meniscus, which broadens under more negative Vbᵢₐₛ and higher relative humidity. The two-dimensional nature of graphene leads to insulation of the encircled central disk from the rest of the graphene sheet after the oxidation of the trenches and results in a small graphene disk with size about 50 nm under all o-SPL conditions.
    Keywords condensation (phase transition) ; electric potential difference ; graphene ; insulating materials ; oxidation ; relative humidity ; vapors
    Language English
    Dates of publication 2019-0923
    Size p. 25422-25427.
    Publishing place American Chemical Society
    Document type Article
    ISSN 1932-7455
    DOI 10.1021/acs.jpcc.9b04175
    Database NAL-Catalogue (AGRICOLA)

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  5. Article ; Online: Variations in the Effective Work Function of Graphene in a Sliding Electrical Contact Interface under Ambient Conditions.

    Huang, Shuei-De / Chu, En-De / Wang, Yu-Han / Liou, Jhe-Wei / Wang, Ruei-Si / Woon, Wei-Yen / Chiu, Hsiang-Chih

    ACS applied materials & interfaces

    2022  

    Abstract: Control of work function (WF) in graphene is crucial for graphene application in electrode material replacement and electrode surface protection in optoelectronic devices. Although efforts have been made to manipulate the effective WF of graphene to ... ...

    Abstract Control of work function (WF) in graphene is crucial for graphene application in electrode material replacement and electrode surface protection in optoelectronic devices. Although efforts have been made to manipulate the effective WF of graphene to optimize its application, most studies have focused on graphene employed in static electrical contact interfaces. In this work, we investigated WF variations of supported single-layer graphene (SLG) in sliding electrical contact under ambient conditions, which was achieved by sliding an electrically biased conductive atomic force microscopy (cAFM) probe on the SLG surface. The effective WF, structural properties, and chemical compositions of rubbed SLG were subsequently measured by Kelvin probe force microscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy, respectively. We found that the effective WF of the rubbed SLG was governed by both the tunneling triboelectric effect (TTE) and tribochemical-induced surface functionalization. The TTE charges generated by the sliding cAFM probe tunneled through the structural defects of the SLG and were trapped underneath the SLG. The SLG will be either p-doped or n-doped depending on the type of TTE charges and the polarity of electric bias applied to the cAFM probe during the rubbing process. However, the applied electric bias also led to the electrolysis of a water meniscus formed at the cAFM probe-SLG contact, resulting in surface oxidation and the increase of SLG WF. Further absorption of ambient water molecules on the oxygenated functional groups gradually reduced the SLG WF. The influence of TTE and surface functionalization on the SLG WF depends on the magnitude and polarity of applied electric biases, relative humidity, and physical properties of the supporting substrates. Our results demonstrate that the effective WF of SLG in a sliding electrical contact interface will vary with time and might need to be considered for related applications.
    Language English
    Publishing date 2022-04-19
    Publishing country United States
    Document type Journal Article
    ISSN 1944-8252
    ISSN (online) 1944-8252
    DOI 10.1021/acsami.2c02096
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: Variations in the Effective Work Function of Graphene in a Sliding Electrical Contact Interface under Ambient Conditions

    Huang, Shuei-De / Chu, En-De / Wang, Yu-Han / Liou, Jhe-Wei / Wang, Ruei-Si / Woon, Wei-Yen / Chiu, Hsiang-Chih

    ACS applied materials & interfaces. 2022 Apr. 19, v. 14, no. 23

    2022  

    Abstract: Control of work function (WF) in graphene is crucial for graphene application in electrode material replacement and electrode surface protection in optoelectronic devices. Although efforts have been made to manipulate the effective WF of graphene to ... ...

    Abstract Control of work function (WF) in graphene is crucial for graphene application in electrode material replacement and electrode surface protection in optoelectronic devices. Although efforts have been made to manipulate the effective WF of graphene to optimize its application, most studies have focused on graphene employed in static electrical contact interfaces. In this work, we investigated WF variations of supported single-layer graphene (SLG) in sliding electrical contact under ambient conditions, which was achieved by sliding an electrically biased conductive atomic force microscopy (cAFM) probe on the SLG surface. The effective WF, structural properties, and chemical compositions of rubbed SLG were subsequently measured by Kelvin probe force microscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy, respectively. We found that the effective WF of the rubbed SLG was governed by both the tunneling triboelectric effect (TTE) and tribochemical-induced surface functionalization. The TTE charges generated by the sliding cAFM probe tunneled through the structural defects of the SLG and were trapped underneath the SLG. The SLG will be either p-doped or n-doped depending on the type of TTE charges and the polarity of electric bias applied to the cAFM probe during the rubbing process. However, the applied electric bias also led to the electrolysis of a water meniscus formed at the cAFM probe–SLG contact, resulting in surface oxidation and the increase of SLG WF. Further absorption of ambient water molecules on the oxygenated functional groups gradually reduced the SLG WF. The influence of TTE and surface functionalization on the SLG WF depends on the magnitude and polarity of applied electric biases, relative humidity, and physical properties of the supporting substrates. Our results demonstrate that the effective WF of SLG in a sliding electrical contact interface will vary with time and might need to be considered for related applications.
    Keywords Raman spectroscopy ; X-ray photoelectron spectroscopy ; absorption ; ambient water ; atomic force microscopy ; electrodes ; electrolysis ; graphene ; oxidation ; relative humidity
    Language English
    Dates of publication 2022-0419
    Size p. 27328-27338.
    Publishing place American Chemical Society
    Document type Article
    ISSN 1944-8252
    DOI 10.1021/acsami.2c02096
    Database NAL-Catalogue (AGRICOLA)

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  7. Article ; Online: Formation of p-type ZnO thin film through co-implantation.

    Chuang, Yao-Teng / Liou, Jhe-Wei / Woon, Wei-Yen

    Nanotechnology

    2017  Volume 28, Issue 3, Page(s) 35603

    Abstract: We present a study on the formation of p-type ZnO thin film through ion implantation. Group V dopants (N, P) with different ionic radii are implanted into chemical vapor deposition grown ZnO thin film on GaN/sapphire substrates prior to thermal ... ...

    Abstract We present a study on the formation of p-type ZnO thin film through ion implantation. Group V dopants (N, P) with different ionic radii are implanted into chemical vapor deposition grown ZnO thin film on GaN/sapphire substrates prior to thermal activation. It is found that mono-doped ZnO by N
    Language English
    Publishing date 2017-01-20
    Publishing country England
    Document type Journal Article
    ZDB-ID 1362365-5
    ISSN 1361-6528 ; 0957-4484
    ISSN (online) 1361-6528
    ISSN 0957-4484
    DOI 10.1088/1361-6528/28/3/035603
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article: Nucleation and growth dynamics of graphene grown through low power capacitive coupled radio frequency plasma enhanced chemical vapor deposition

    Yen, Chun-Chieh / Chang, Yu-Chen / Tsai, Hung-Chieh / Woon, Wei-Yen

    Carbon. 2019 Dec., v. 154

    2019  

    Abstract: We present the study on graphene growth on Cu substrate through low power capacitive coupled radio frequency (RF) plasma enhanced chemical vapor deposition. Fully-covered graphene was grown on Cu substrate through a plasma composed of various argon/ ... ...

    Abstract We present the study on graphene growth on Cu substrate through low power capacitive coupled radio frequency (RF) plasma enhanced chemical vapor deposition. Fully-covered graphene was grown on Cu substrate through a plasma composed of various argon/methane/hydrogen gas ratio with a 50 W RF power source within a minute under a relatively low substrate temperature at 850 ∘C. The nucleation and growth dynamics is further investigated through processing and analysis of the images acquired through scanning electron microscopy, and interpreted with a modified Johnson-Mehl-Avrami-Kolmogorov model. The roles of hydrogen in limiting the nucleation density and stabilization of the graphene grain edges are discussed in light of the analysis, and a time dependent grain expansion rate in which the graphene grains grow fast at the early stage and saturated at later stage is implemented into the model to achieve good fitting of the coverage evolution.
    Keywords argon (noble gases) ; copper ; graphene ; hydrogen ; methane ; radio waves ; scanning electron microscopy ; temperature ; vapors
    Language English
    Dates of publication 2019-12
    Size p. 420-427.
    Publishing place Elsevier Ltd
    Document type Article
    ISSN 0008-6223
    DOI 10.1016/j.carbon.2019.08.042
    Database NAL-Catalogue (AGRICOLA)

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  9. Article ; Online: Exploring the mechanical properties of nanometer-thick elastic films through micro-drop impinging on large-area suspended graphene.

    Liao, Yu-Tzu / Peng, Shiuan-Ying / Chuang, Kai-Wen / Liao, Ying-Chih / Kuramitsu, Yasuhiro / Woon, Wei-Yen

    Nanoscale

    2021  Volume 14, Issue 1, Page(s) 42–48

    Abstract: In this work, the dependence of effective Young's modulus on the thickness of suspended graphene was confirmed through a drop impingement method. Large area suspended graphene (LSG) layers with a diameter of up to 400 μm and a nanometer thickness were ... ...

    Abstract In this work, the dependence of effective Young's modulus on the thickness of suspended graphene was confirmed through a drop impingement method. Large area suspended graphene (LSG) layers with a diameter of up to 400 μm and a nanometer thickness were prepared through transferring chemical vapor deposition grown graphene from copper substrates. 4, 8, and 12-layer LSG samples were found to be crumpled yet defect-free. The mechanical properties of LSG were first studied by observing its interaction with impinging droplets from an ink-jet nozzle. First, the effective Young's modulus was calculated by fitting the instant deformation captured by high speed photography within microseconds. Next, droplets deposited on LSG caused deformation and generated wrinkles and the effective Young's modulus was calculated from the number of wrinkles. The above methods yielded effective Young's modulus values ranging from 0.3 to 3.4 TPa. The results from these methods all indicated that the effective Young's modulus increases with the decreasing thickness or size of suspended graphene layers. Moreover, the crumpled LSG yields higher effective Young's modulus than ideal flat graphene. These comprehensive results from complementary methodologies with precise LSG thickness control down to the nanometer scale provide good evidence to resolve the debate on the thickness dependence of mechanical strength for LSG.
    Language English
    Publishing date 2021-12-23
    Publishing country England
    Document type Journal Article
    ZDB-ID 2515664-0
    ISSN 2040-3372 ; 2040-3364
    ISSN (online) 2040-3372
    ISSN 2040-3364
    DOI 10.1039/d1nr05918a
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Spectroscopic and Electrical Characterizations of Low-Damage Phosphorous-Doped Graphene via Ion Implantation.

    He, Shih-Ming / Huang, Cheng-Chun / Liou, Jhe-Wei / Woon, Wei-Yen / Su, Ching-Yuan

    ACS applied materials & interfaces

    2019  Volume 11, Issue 50, Page(s) 47289–47298

    Abstract: Development of n-/p-type semiconducting graphenes is a critical route to implement in graphene-based nanoelectronics and optronics. Compared to the p-type graphene, the n-type graphene is more difficult to be prepared. Recently, phosphorous doping was ... ...

    Abstract Development of n-/p-type semiconducting graphenes is a critical route to implement in graphene-based nanoelectronics and optronics. Compared to the p-type graphene, the n-type graphene is more difficult to be prepared. Recently, phosphorous doping was reported to achieve air-stable and high mobility of n-typed graphene. The phosphorous-doped graphene (P-Gra) by ion implantation is considered as an ideal method for tailoring graphene due to its IC compatible process; however, for a conventional ion implanter, the acceleration energy is in the order of kiloelectron volts (keV), thus severely destroys the sp
    Language English
    Publishing date 2019-12-04
    Publishing country United States
    Document type Journal Article
    ISSN 1944-8252
    ISSN (online) 1944-8252
    DOI 10.1021/acsami.9b18479
    Database MEDical Literature Analysis and Retrieval System OnLINE

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