Papers
Solvent Effects of N, N-dimethylformamide and Methanol on Mass Spectrometry Imaging by Tapping-mode Scanning Probe Electrospray Ionization, Yoichi Otsuka, Nijiho One, Mengze Sun, Shuichi Shimma, Osamu Urakawa, Tomoya Kudo, Shinichi Yamaguchi and Michisato Toyoda, Analyst, 148, 1275-1284 (2023). https://doi.org/10.1039/d2an01953a
Advances in Mass Spectrometry Imaging for Visualization of Cellular Information in Biological Tissues, Yoichi Otsuka, Proteome Letters, 7, 53-62 (2022). https://doi.org/10.14889/jpros.7.2_53
Shape-dependent conduction regime in self-doped polyaniline, Jiannan Bao, Yoichi Otsuka, Hiroshi Ohoyama and Takuya Matsumoto, J. Phys. Chem. C., 126, 8029-8036 (2022). https://doi.org/10.1021/acs.jpcc.1c10929
In-Materio Reservoir Computing in a Sulfonated Polyaniline Network, Yuki Usami, Bram van de Ven, Dilu G. Mathew, Tao Chen, Takumi Kotooka, Yuya Kawashima, Yuichiro Tanaka, Yoichi Otsuka, Hiroshi Ohoyama, Hakaru Tamukoh, Hirofumi Tanaka, Wilfred G. van der Wiel, Takuya Matsumoto, Advanced Materials, 33, 2102688 (2021). https://doi.org/10.1002/adma.202102688
Direct liquid extraction and ionization techniques for understanding multimolecular environments in biological systems, Yoichi Otsuka*, Mass Spectrometry (Tokyo), 10, A0095 (2021). https://doi.org/10.5702/massspectrometry.A0095
Tapping-mode Scanning Probe Electrospray Ionization: Fusion of SPM with Mass Spectrometry, Yoichi Otsuka*, Japanese Journal of Applied Physics, 60 SE0802 (2021). https://doi.org/10.35848/1347-4065/abefac.
Sacrificial Gold Coating Enhances Transport of Liquid Metal in Pressurized Fountain Pen Lithography, Gideon I. Livshits*, Jiannan Bao, Leo Sakamoto, Yuki Usami, Yoichi Otsuka, and Takuya Matsumoto, Scientific Reports, 11, 4670 (2021)., https://doi.org/10.1038/s41598-021-84065-4.
High spatial resolution multi-modal imaging by tapping-mode scanning probe electrospray ionization with feedback control, Yoichi Otsuka*, Bui Kamihoriuchi, Aya Takeuchi, Futoshi Iwata, Sara Tortorella, Takuya Matsumoto, Analytical Chemistry, 93, 4, 2263–2272 (2021). https://doi.org/10.1021/acs.analchem.0c04144.
Homogeneous chemical state of self-doped polyaniline sub-micrometer thickness lines fabricated by fountain-pen lithography, Jiannan Bao, Yoichi Otsuka*, Takuya Matsumoto*, Japanese Journal of Applied Physics, 60, 015002 (2021). https://doi.org/10.35848/1347-4065/abd04e
High spatial resolution multi-modal imaging by tapping-mode scanning probe electrospray ionization with feedback control, Yoichi Otsuka*, Bui Kamihoriuchi, Aya Takeuchi, Futoshi Iwata, Sara Tortorella, Takuya Matsumoto, Analytical Chemistry, 93, 4, 2263–2272 (2021), https://doi.org/10.1021/acs.analchem.0c04144.
Homogeneous chemical state of self-doped polyaniline sub-micrometer thickness lines fabricated by fountain-pen lithography, Jiannan Bao, Yoichi Otsuka*, Takuya Matsumoto*, Japanese Journal of Applied Physics, 60, 015002 (2021). https://doi.org/10.35848/1347-4065/abd04e
Frequency-modulation Kelvin probe force microscopy under tapping mode operation for surfaces with large protrusions, Tomoki Misaka, Kentaro Kajimoto, Kento Araki, Yoichi Otsuka, and Takuya Matsumoto*. Japanese Journal of Applied Physics, 59, 90906 (2020). https://doi.org/10.35848/1347-4065/abac6e
Local-field-induced current noise in shape-limited self-doped polyaniline, Jiannan Bao, Yoichi Otsuka*, Riko Etoh, Yuki Usami and Takuya Matsumoto*. Nanotechnology, 31, 365203 (2020). https://doi.org/10.1088/1361-6528/ab96e4
Statistical procedure for comparison of potential difference between single-component sample surface, Kentaro Kajimoto, Kento Araki, Tomoki Misaka, Leo Sakamoto, Yoichi Otsuka, Hiroshi Ohoyama, Takuya Matsumoto*. Applied Physics Express, 12, 75011 (2019). https://doi.org/10.7567/1882-0786/ab26d2
Chemical Control of Electronic Coupling between a Ruthenium Complex and Gold Electrode for Resonant Tunneling Conduction, Yoichi Otsuka, Satoshi Nishijima, Leo Sakamoto, Kentaro Kajimoto, Kento Araki, Tomoki Misaka, Hiroshi Ohoyama, Takuya Matsumoto*. ACS Applied Materials and Interfaces, 11, 24331-24338 (2019). https://pubs.acs.org/doi/abs/10.1021/acsami.9b05569
Visualization of Sampling and Ionization Processes in Scanning Probe Electrospray Ionization Mass Spectrometry, Bui Kamihoriuchi, Yoichi Otsuka*, Aya Takeuchi, Futoshi Iwata, Takuya Matsumoto. Mass Spectrometry (Tokyo), 7(2), S0078, (2018). https://doi.org/10.5702/massspectrometry.S0078
Resonant tunneling via a Ru–dye complex using a nanoparticle bridge junction, Satoshi Nishijima, Yoichi Otsuka, Hiroshi Ohoyama, Kentaro Kajimoto, Kento Araki, Takuya Matsumoto*. Nanotechnology 29, 245205 (2018). https://doi.org/10.1088/1361-6528/aab7ba
Conjugated Electrical Properties of Au Nanoparticles-Polyaniline Network, Yuki Usami, Yoichi Otsuka, Yasuhisa Naitoh, Takuya Matsumoto*. Japanese Journal of Applied Physics 56, 128001 (2017). https://doi.org/10.7567/JJAP.56.128001
Reduced Sampling Size with Nanopipette for Tapping-Mode Scanning Probe Electrospray Ionization Mass Spectrometry Imaging, Tsuyoshi Kohigashi, Yoichi Otsuka*, Ryo Shimazu, Takuya Matsumoto, Futoshi Iwata, Hideya Kawasaki, Ryuichi Arakawa*. Mass Spectrometry (Tokyo), 5, S0054 (2016). https://doi.org/10.5702/massspectrometry.S0054
Visualization of cancer-related chemical components in mouse pancreas tissue by tapping-mode scanning probe electrospray ionization mass spectrometry, Yoichi Otsuka*, Shuya Satoh, Junpei Naito, Masafumi Kyogaku, Hiroyuki Hashimoto. Journal of Mass Spectrometry, 50, 1157-1162 (2015). https://doi.org/10.1002/jms.3634
On-line visualization of multicolor chemical images with stimulated Raman scattering spectral microscopy, Yoichi Otsuka*, Koji Makara, Shuya Satoh, Hiroyuki Hashimoto, Yasuyuki Ozeki. Analyst, 140, 2984-2987 (2015). https://doi.org/10.1039/C5AN00335K
Label-free visualization of acetaminophen-induced liver injury by high-speed stimulated Raman scattering spectral microscopy and multivariate image analysis, Shuya Satoh†, Yoichi Otsuka†, Yasuyuki Ozeki, Kazuyoshi Itoh, Akinori Hashiguchi, Ken Yamazaki, Hiroyuki Hashimoto, Michiie Sakamoto. Pathology International, 64, 518-26 (2014). (†equally contributed) https://doi.org/10.1111/pin.12206
Imaging mass spectrometry of a mouse brain by tapping-mode scanning probe electrospray ionization, Yoichi Otsuka*, Junpei Naito, Shuya Satoh, Masafumi Kyogaku, Hiroyuki Hashimoto, Ryuichi Arakawa. Analyst, 139, 2336-41 (2014). https://doi.org/10.1039/C3AN02340K
High-speed molecular spectral imaging of tissue with stimulated Raman scattering, Yasuyuki Ozeki, Wataru Umemura, Yoichi Otsuka, Shuya Satoh, Hiroyuki Hashimoto, Kazuhiko Sumimura, Norihiko Nishizawa, Kiichi Fukui, Kazuyoshi Itoh. Nature Photonics, 6, 845-51 (2012). https://doi.org/10.1038/nphoton.2012.263
Method for enhancing peptide signal in time-of-flight secondary ion mass spectrometry, Junpei Naito, Shuya Satoh, Yoichi Otsuka, Hiroyuki Hashimoto. International Journal of Mass Spectrometry, 319, 64-67 (2012). https://doi.org/10.1016/j.ijms.2012.03.003
Scanning probe electrospray ionization for ambient mass spectrometry, Yoichi Otsuka*, Sayuri Shide, Junpei Naito, Masafumi Kyogaku, Hiroyuki Hashimoto, Ryuichi Arakawa. Rapid Communications in Mass Spectrometry, 26, 2725-32 (2012). https://doi.org/10.1002/rcm.6399
Nano-scale resistivity reduction in single-grain of lead phthalocyanine, Satomi Tabuchi, Yoichi Otsuka, Masaki Kanai, Hitoshi Tabata, Takuya Matsumoto, Tomoji Kawai*. Organic Electornics, 11, 916-24 (2010). https://doi.org/10.1016/j.orgel.2010.02.011
Formation of multinuclear metal-terpyridyl complexes covalently bound to carbon substrates, Wataru Kubo, Masashi Nagao, Yoichi Otsuka, Tsutomu Homma, Hirokatsu Miyata*. Langumuir, 25, 13340-3 (2009). https://doi.org/10.1021/la902055h
Synthesis and DNA cleaving activity of water-soluble non-conjugated thienyl tetraynes, Kohei Torikai, Yoichi Otsuka, Makoto Nishimura, Megumi Sumida, Tomoji Kawai, Kiyotoshi Sekiguchi, Ikuo Ueda. Bioorganic & medical chemistry, 16, 5441-51 (2008). https://doi.org/10.1016/j.bmc.2008.04.009
Refinement of Conditions of Point-Contact Current Imaging Atomic Force Microscopy for Molecular-Scale Conduction Measurements, Takashi Tajima, Hirofumi Tanaka, Takuya Matsumoto, Yoichi Otsuka, Yoshitaka Sugawara, Takuji Ogawa*. Nanotechnology, 18, 95501 (2007). https://doi.org/10.1088/0957-4484/18/9/095501
Porphyrin Molecular Nanodevices Wired Using Single‐Walled Carbon Nanotubes, H. Tanaka, T. Yajima, T. Matsumoto, Y. Otsuka, T. Ogawa*. Advanced Materials, 18, 1411-1415 (2006). https://doi.org/10.1002/adma.200501249
Conductance measurement of a DNA network in nanoscale by point contact current imaging atomic force microscopy, Ayumu Terawaki, Yoichi Otsuka, HeaYeon Lee, Takuya Matsumoto, Hidekazu Tanaka, and Tomoji Kawai*. Appl. Phys. Lett., 86, 113901 (2005). https://doi.org/10.1063/1.1886265
Printing electrode for top-contact molecular junction, Kaoru Ojima, Yoichi Otsuka, Takuya Matsumoto, and Tomoji Kawai*. Appl. Phys. Lett. , 87, 234110 (2005). https://doi.org/10.1063/1.2140471
A simple fabrication method of nanogap electrodes for top-contacted geometry: application to porphyrin nanorod and DNA network, Yoichi Otsuka, Yasuhisa Naitoh, Takuya Matsumoto, Wataru Mizutani, Hitoshi Tabata, Tomoji Kawai*. Nanotechnology, 15, 1639 (2004). https://doi.org/10.1088/0957-4484/15/11/046
Toward the DNA electronics, Hitoshi Tabata, Lin Tao Cai, Jianhua Gu, Shin-ichi Tanaka, Yoichi Otsuka, Yutaka Sacho, Masateru Taniguchi, Tomoji Kawai*. Synthetic Metals, 133-134, 469-472 (2003). https://doi.org/10.1016/S0379-6779(02)00386-7
Point-contact current-imaging atomic force microscopy: Measurement of contact resistance between single-walled carbon nanotubes in a bundle, Yoichi Otsuka, Yasuhisa Naitoh, Takuya Matsumoto, Tomoji Kawai*. Appl. Phys. Lett., 92, 1944 (2003). https://doi.org/10.1063/1.1563308
Humidity Dependence of Electrical Resistivity in Poly(dG)Poly(dC) DNA Thin Film, Masateru Taniguchi, Yoichi Otsuka, Hitoshi Tabata, Tomoji Kawai*. Jpn. J. Appl. Phys., 42, 6629 (2003). https://doi.org/10.1143/JJAP.42.6629
Influence of Humidity on the Electrical Conductivity of Synthesized DNA film on Nanogap Electrode, Yoichi Otsuka, Hea-Yeon Lee, Jian-hua Gu, Jeory-O Lee, Kyung-Hwa Yoo, Hidekazu Tanaka, Hitoshi Tabata, Tomoji Kawai*. Jpn. J. Appl. Phys., 41, 891 (2002). https://doi.org/10.1143/JJAP.41.891
Control of electrical conduction in DNA using oxygen hole doping, Hea-Yeon Lee, Hidekazu Tanaka, Yoichi Otsuka, Kyung-Hwa Yoo, Jeong-O Lee, Tomoji Kawai*. Appl. Phys. Lett., 80, 1670 (2002). https://doi.org/10.1063/1.1456972
Self-assembled dye-DNA network and its photoinduced electrical conductivity, Jianhua Gu, Shin-ichi Tanaka, Yoichi Otsuka, Hitoshi Tabata, Tomoji Kawai*. Appl. Phys. Lett., 80, 688 (2002). https://doi.org/10.1063/1.1435805
Electric Conductivity of Dye Modified DNA films with and without Light Irradiation in Various Humidities, Jianhua Gu, Shin-ichi Tanaka, Yoichi Otsuka, Hitoshi Tabata, Tomoji Kawai*. J. Appl. Phys., 92, 2816 (2002). https://doi.org/10.1063/1.1498959
A Nano tester: A new technique for nanoscale electrical characterization by point-contact current- imaging atomic force microscopy, Yoichi Otsuka, Yasuhisa Naitoh, Takuya Matsumoto, Tomoji Kawai*. Jpn. J. Appl. Phys., 41, L742 (2002). https://doi.org/10.1143/JJAP.41.L742