Faculty Profiles - OHNO, Yutaka

Papers - OHNO, Yutaka

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Fabrication of Carbon Nanotube Thin Films for Flexible Transistors by Using a Cross-Linked Amine Polymer Reviewed International journal

Matsumoto Kaisei, Ueno Kazuki, Hirotani Jun, Ohno Yutaka, Omachi Haruka

CHEMISTRY-A EUROPEAN JOURNAL Vol. 26 ( 28 ) page： 6118 - 6121 2020.5

High output voltage generation of over 5 V from liquid motion on single-layer MoS2 Reviewed International journal

Aji Adha Sukma, Nishi Ryohei, Ago Hiroki, Ohno Yutaka

NANO ENERGY Vol. 68 2020.2

High-output, transparent, stretchable triboelectric nanogenerator based on carbon nanotube thin film toward wearable energy harvesters

Matsunaga Masahiro, Hirotani Jun, Kishimoto Shigeru, Ohno Yutaka

NANO ENERGY Vol. 67 2020.1

Fast and Ultraclean Approach for Measuring the Transport Properties of Carbon Nanotubes

Wei Nan, Laiho Patrik, Khan Abu Taher, Hussain Aqeel, Lyuleeva Alina, Ahmed Saeed, Zhang Qiang, Liao Yongping, Tian Ying, Ding Er-Xiong, Ohno Yutaka, Kauppinen Esko I.

ADVANCED FUNCTIONAL MATERIALS Vol. 30 ( 5 ) 2020.1

Dependence of enhancement factor on electrode size for field emission current from carbon nanotube on silicon wafer

Funayama Keita, Tanaka Hiroya, Hirotani Jun, Shimaoka Keiichi, Ohno Yutaka, Tadokoro Yukihiro

NANOTECHNOLOGY Vol. 30 ( 42 ) page： 425201 2019.10

Aqueous two-phase extraction of semiconducting single-wall carbon nanotubes with isomaltodextrin and thin-film transistor applications

Omachi Haruka, Komuro Tomohiko, Matsumoto Kaisei, Nakajima Minako, Watanabe Hikaru, Hirotani Jun, Ohno Yutaka, Shinohara Hisanori

APPLIED PHYSICS EXPRESS Vol. 12 ( 9 ) 2019.9

Effects of HLA mismatch on cytomegalovirus reactivation in cord blood transplantation

Yokoyama Hisayuki, Kanda Junya, Kato Shunichi, Kondo Eisei, Maeda Yoshinobu, Saji Hiroo, Takahashi Satoshi, Onizuka Makoto, Onishi Yasushi, Ozawa Yukiyasu, Kanamori Heiwa, Ishikawa Jun, Ohno Yuju, Ichinohe Tatsuo, Takanashi Minoko, Kato Koji, Atsuta Yoshiko, Kanda Yoshinobu, Ikegame Kazuhiro, Utsunomiya Atae, Kawase Takakazu, Kim Sung-Won, Kuwatsuka Yachiyo, Kobayashi Takeshi, Takatsuka Yoshifusa, Takahashi Yoshiyuki, Tanaka Junji, Tamaki Hiroya, Tsuji Masanori, Nishida Tetsuya, Masuko Masayoshi, Matsuno Ryosuke, Murata Makoto, Morishima Satoko, Morishima Yasuo, Yokoyama Hisayuki, Wake Atsushi, Watanabe Nobuhiro, Ashida T., Hoshino Takumi, Yabe Toshio, Sakamoto Kana, Fuji Shigeo, Miyamura Koichi, Arima Nobuyoshi, Kondo Eisei, Yoshimitsu Makoto, Kawamura Koji, Kawata Takahito, Kishimoto Kenji, Tatara Raine, Hagino Takeshi, Fujiwara Shin-Ichiro, Shimomura Yoshimitsu, Sakaguchi Hirotoshi, Hirabayashi Shigeki, Ishii Hiroto, Onda Yoshiyuki, Kato Itaru, Kawajiri Akihisa, Shindo Takero, Tokunaga Masahito, Nonami Atsushi, Muranushi Hiroyuki, Yoshinaga Noriyoshi, Kawashima Naomi, Shiratori Souichi, Tada Yuma, Tanoue Sus-Umu, Hirayama Masahiro, Fukunaga Keiko, Ohbiki Marie

BONE MARROW TRANSPLANTATION Vol. 54 ( 7 ) page： 1004 - 1012 2019.7

Electrical property measurement of two-dimensional hole-gas layer on hydrogen-terminated diamond surface in vacuum-gap-gate structure

Inaba Masafumi, Kawarada Hiroshi, Ohno Yutaka

APPLIED PHYSICS LETTERS Vol. 114 ( 25 ) page： 253504 2019.6

Operando Analysis of Electron Devices Using Nanodiamond Thin Films Containing Nitrogen-Vacancy Centers

Uchiyama Haruki, Saijo Soya, Kishimoto Shigeru, Ishi-Hayase Junko, Ohno Yutaka

ACS OMEGA Vol. 4 ( 4 ) page： 7459 - 7466 2019.4

Language：Japanese Publisher：ACS Omega

Operando analysis of electron devices provides key information regarding their performance enhancement, reliability, thermal management, etc. For versatile operando analysis of devices, the nitrogen-vacancy (NV) centers in diamonds are potentially useful media owing to their excellent sensitivity to multiple physical parameters. However, in single crystal diamond substrates often used for sensing applications, placing NV centers in contiguity with the active channel is difficult. This study proposes an operando analysis method using a nanodiamond thin film that can be directly formed onto various electron devices by a simple solution-based process. The results of noise analysis of luminescence of the NV centers in nanodiamonds show that the signal-to-noise ratio in optically detected magnetic resonance can be drastically improved by excluding the large 1/f noise of nanodiamonds. Consequently, the magnetic field and increase in temperature caused by the device current could be simultaneously measured in a lithographically fabricated metal microwire as a test device. Moreover, the spatial mapping measurement is demonstrated and shows a similar profile with the numerical calculation.

DOI： 10.1021/acsomega.9b00344

Web of Science

Scopus

PubMed

Graft-versus-MDS effect after unrelated cord blood transplantation: a retrospective analysis of 752 patients registered at the Japanese Data Center for Hematopoietic Cell Transplantation

Ishiyama Ken, Aoki Jun, Itonaga Hidehiro, Uchida Naoyuki, Takahashi Satoshi, Ohno Yuju, Matsuhashi Yoshiko, Sakura Toru, Onizuka Makoto, Miyakoshi Shigesaburo, Takanashi Minoko, Fukuda Takahiro, Atsuta Yoshiko, Nakao Shinji, Miyazaki Yasushi

BLOOD CANCER JOURNAL Vol. 9 ( 3 ) 2019.3

Highly Uniform, Flexible Microelectrodes Based on the Clean Single-Walled Carbon Nanotube Thin Film with High Electrochemical Activity

Nguyen Xuan Viet, Kishimoto Shigeru, Ohno Yutaka

ACS APPLIED MATERIALS & INTERFACES Vol. 11 ( 6 ) page： 6389 - 6395 2019.2

Enhancement of the electron transfer rate in carbon nanotube flexible electrochemical sensors by surface functionalization

Nishimura Keita, Ushiyama Takuya, Viet Nguyen Xuan, Inaba Masafumi, Kishimoto Shigeru, Ohno Yutaka

ELECTROCHIMICA ACTA Vol. 295 page： 157 - 163 2019.2

Origins of the variability of the electrical characteristics of solution-processed carbon nanotube thin-film transistors and integrated circuits

Hirotani Jun, Kishimoto Shigeru, Ohno Yutaka

NANOSCALE ADVANCES Vol. 1 ( 2 ) page： 636 - 642 2019.2

Language：Japanese Publisher：Nanoscale Advances

Carbon nanotube (CNT) thin-film transistors based on solution processing have great potential for use in future flexible and wearable device technologies. However, the considerable variability of their electrical characteristics remains a significant obstacle to their practical use. In this work, we investigated the origins of the variability of these electrical characteristics by performing statistical analysis based on spatial autocorrelation and Monte Carlo simulation. The spatial autocorrelation of the on-current decreased with increasing distance on the order of millimetres, showing that macroscopic non-uniformity of the CNT density was one of the causes of the characteristic variability. In addition, even in the local regime where the macroscopic variability is negligible, the variability was greater than that expected based on the Monte Carlo simulation. The CNT aggregation could be attributed to microscopic variability. We also investigated the variability of the properties of integrated circuits such as inverters and ring oscillators fabricated on flexible plastic film. All of the inverters worked well, and their threshold voltage variations were fairly small. As the number of stages in the ring oscillator increased, the yield decreased, although the oscillation frequency variability improved.

DOI： 10.1039/c8na00184g

Web of Science

Scopus

Carbon Nanotube Thin Films for High-Performance Flexible Electronics Applications

Hirotani Jun, Ohno Yutaka

TOPICS IN CURRENT CHEMISTRY Vol. 377 ( 1 ) page： 3 2019.2

Noise Modeling in Field Emission and Evaluation of the Nano-Receiver in Terms of Temperature

Funayama Keita, Tanaka Hiroya, Hirotani Jun, Shimaoka Keiichi, Ohno Yutaka, Tadokoro Yukihiro

IEEE ACCESS Vol. 7 page： 57820 - 57828 2019

Language：Japanese Publisher：IEEE Access

The field-emission phenomenon is exploited in a broad variety of applications and systems. Previous studies have reported that the current induced by field emission strongly and inherently depend on the temperature. This dependence enhances the noise in the current, which results in performance degradation in, for example, signal detection and communications in nanoscale receivers. In this paper, a mathematical model is presented for the suppression of the noise based on its probability density. Our experiment and analysis revealed that the density follows a Gaussian distribution, and the dependence on temperature is observed to be exponential. This result is intriguing because in the field of signal processing and communication, the influence of temperature is often considered with a noiseerature model, namely, linear dependence. Using our derived model, we theoretically evaluated the communication performance of a nanoscale receiver; owing to the exponential dependence on temperature, severe performance degradation was found with increasing temperature. This means that, as field-emission technology continues to be developed, the temperature should be kept low, for example, at room temperature, to secure the reliability of nanoscale communication devices.

DOI： 10.1109/ACCESS.2019.2913692

Web of Science

Scopus

Stochastic Optimal Control to Minimize the Impact of Manufacturing Variations on Nanomechanical Systems

Ito Yuji, Funayama Keita, Hirotani Jun, Ohno Yutaka, Tadokoro Yukihiro

IEEE ACCESS Vol. 7 page： 171195 - 171205 2019

Language：Japanese Publisher：IEEE Access

This paper presents a control method intended to suppress the effects of manufacturing variations on nanomechanical systems. Often, the resonance characteristics of nanoscale devices are inconsistent, due to unavoidable variations in the fabrication process. This is important because resonant vibrations enhance the sensitivities of the devices. As such, the sensitivities of these systems can be degraded if the device characteristics are not identified. To address this fundamental problem, this paper presents a multidisciplinary method based on control theory, nanotechnology, and communication technology. A stochastic optimal feedback controller is employed to enhance an average sensitivity by regarding the variations as stochastic parameters. This method is applied to nanoscale receivers that detect transmitted binary data based on binary phase-shift keying in communication systems. The proposed method controls the vibrations of carbon nanotubes (CNTs) that serve as the antennas of the receiver. The proposed method is demonstrated via a numerical simulation using nanoscale receivers with the manufacturing variation. The simulation based on experimental data obtained from CNTs shows that the average performance of the devices is enhanced.

DOI： 10.1109/ACCESS.2019.2955697

Web of Science

Scopus

An interdigitated electrode with dense carbon nanotube forests on conductive supports for electrochemical biosensors

Sugime Hisashi, Ushiyama Takuya, Nishimura Keita, Ohno Yutaka, Noda Suguru

ANALYST Vol. 143 ( 15 ) page： 3635 - 3642 2018.8

Non-coherent detection of digitally phase-modulated signals with carbon nanotube cantilever vibration

Tadokoro Y., Ohno Y., Tanaka H.

ELECTRONICS LETTERS Vol. 54 ( 13 ) page： 840 - + 2018.6

Language：Japanese Publisher：Electronics Letters

Towards the realisation of reliable communication systems using simple nanoscale transceivers, this Letter presents a method for the non-coherent detection of digitally phase-modulated signals. Without the synchronisation of the phases of the transmitted and received carrier signals, data transmission cannot be reliably achieved. To address this issue, the proposed method is developed using a nanoscale receiver that receives the binary phase-modulated signal through the mechanical vibration of a carbon nanotube cantilever. The present analysis reveals that this receiver has an interesting characteristic: the two decision statistics available in the receiver have a phase difference of p/2, which means that at least one of the statistics is fairly reliable regardless of the synchronisation error. Through the selection of the more reliable of the two statistics, the proposed method achieves low error in the estimation of the transmitted data even without carrier phase synchronisation. This Letter presents the derivation of the proposed rule for selecting the statistic and numerical results that demonstrate the effectiveness of the proposed method. This Letter is expected to contribute to the realisation of future communication applications using nanoscale transceivers.

DOI： 10.1049/el.2018.0475

Web of Science

Scopus

Detection of Digitally Phase-Modulated Signals Utilizing Mechanical Vibration of CNT Cantilever

Tadokoro Yukihiro, Ohno Yutaka, Tanaka Hiroya

IEEE TRANSACTIONS ON NANOTECHNOLOGY Vol. 17 ( 1 ) page： 84 - 92 2018.1

Phase shifter tuned by varying the spring constant of a nanomechanical cantilever

Tanaka H., Ozaki T., Ohno Y., Tadokoro Y.

JOURNAL OF APPLIED PHYSICS Vol. 122 ( 23 ) 2017.12

Language：Japanese Publisher：Journal of Applied Physics

This paper presents a theoretical study of an adaptive microwave phase shifter based on a nanomechanical resonator. The phase shifter can be tuned to provide an arbitrary phase rotation in the range between -90° and 90° by adjusting the bias voltage applied to the resonator. An analytical model is developed to reveal the underlying mechanism of the phase shifter. It is also analytically demonstrated that the operating frequency can be selected by adjusting the bias voltage. In addition, it is found that the bandwidth is tunable via the quality factor for the cantilever.

DOI： 10.1063/1.4992040

Web of Science

Scopus

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Papers - OHNO, Yutaka