Takashi Uchida

Toyo University · Graduate School of Interdisciplinary New Science

Rare sugars are defined as monosaccharides and their derivatives, which rarely exist in nature and have various beneficial effects on organisms, biomaterials and foods. Glycolipids are composed of sugars and lipids and have been intensively studied in various fields such as environmental engineering, nanotechnology and molecular biology. Here, we s...

Endohedral Fullerene is expected to be utilized for such application as quantum computing or magnetic resonance imaging contrast agent, because it has various material characteristics. It is confirmed that multiply charged fullerene ion beams have been produced on the electron cyclotron resonance ion source (ECRIS) at Osaka Univ. However, it is dif...

A new tandem type source on the basis of electron cyclotron resonance (ECR) plasma has been constructed for producing wide-range mass/charge (m/q) ion beams in Osaka Univ. It is considered to be suitable for synthesizing new molecules using a wide operating range of the proposed ion source. We have already produced and extracted multicharged fuller...

Recently, we reported a fullerene modification using neutral-neutral or neutral-ion collision reactions in the two-chamber configuration of the Bio-Nano electron cyclotron resonance ion source (ECRIS). In our methodology, modified fullerenes can be synthesized in vapor-phase in an ECR plasma, or on a surface of a plasma chamber, and can be characte...

A new generation of fluorescent carbon nano-onions with enhanced solubility in biological media and bright photoluminescence is reported. The nano-onions functionalized with a water soluble boron dipyrromethene dye emit in the far red spectrum with a high quantum yield (ΦF) and are suitable for high resolution imaging. The nanoparticles are charact...

Magnetic nanoparticles are of great importance particularly in the field of biomedicine as well as nanotechnology and nano materials science and technology. Here, we synthesise magnetic alloy-filling carbon nanoparticles (MA@C NPs) via the following two-step procedure; (1) Irradiation of a laser beam of 266 nm wavelength into super-critical benzene...

Nanoparticles composed of silver and silver chloride ([email protected]/* */ NPs) are synthesised by a two-step procedure; (1) Synthesis of silver chloride nanoparticles (AgCl NPs) via phyto reduction mixing an aqueous extract from needles of Pinus densiflora (red pine) with an aqueous solution of silver nitrate (AgNO3) in the absence of light; and...

We report on the modification of fullerenes with iron and chlorine using two individually controllable plasmas in the Bio-Nano electron cyclotron resonance ion source (ECRIS). One of the plasmas is composed of fullerene and the other one is composed of iron and chlorine. The online ion beam analysis allows one to investigate the rate of the vapor-p...

We have been constructing the tandem-type electron cyclotron resonance ion source (ECRIS). Two ion sources of the tandem-type ECRIS are possible to generate plasma individually, and they also confined individual ion species by each different plasma parameter. Hence, it is considered to be suitable for new materials production. As the first step, we...

With about 1000-h of relativistic high-energy ion beams provided by Heavy Ion Medical Accelerator in Chiba, about 70 users are performing various biology experiments every year. A rich variety of ion species from hydrogen to xenon ions with a dose rate of several Gy/min is available. Carbon, iron, silicon, helium, neon, argon, hydrogen, and oxygen...

A new electron cyclotron resonance ion source has been constructed at Oshima College with a 2.45 GHz magnetron microwave source and permanent magnets employed as the main components. In addition, a solid-state power amplifier with a frequency range of 2.5–6.0 GHz was installed to study two-frequency plasma heating. Three solenoid coils were set up...

There is a desire that a carbon-ion radiotherapy facility will produce various ion species for fundamental research. Although the present Kei2-type ion sources are dedicated for the carbon-ion production, a future ion source is expected that could provide: (1) carbon-ion production for medical use, (2) various ions with a charge-to-mass ratio of 1/...

Phytosynthesis of nanomaterials is advantageous since it is economical, ecofriendly, and simple, and, what is more, in the synthetic protocols, nontoxic chemicals and biocompatible materials are used. Here, a green synthetic methodology of nanoparticles (NPs) composed of silver (Ag) and silver chloride (AgCl) NPs is developed using a leaf extract o...

Precise control of the placement and patterning of graphene on various substrates has tremendous impact in many fields, such as nanoscale electronics, multifunctional optoelectronic devices, and molecular sensing. A one-step facile technique involving N2-plasma promotes surface modification and enhances the surface wettability of the substrate. The...

We demonstrate growth and characterization of carbon nanowall (CNW) films on silicon substrates by the surface-wave microwave plasma-enhanced chemical vapor deposition method. The grown CNWs in the film show orientation anisotropy. A CNW is composed of well-crystallized nanographite. The deposition of CNW films, in particular the film thickness and...

The output of highly charged ions from an electron cyclotron resonance ion source (ECRIS) consists of ionic losses from a highly confined plasma. Therefore, an increase of the output of the ions of interest always is a compromise between an increase in the confinement and an increase of the losses. One route towards a solution consists of attacking...

A compact ECR ion source has utilized for carbon radiotherapy. In order to increase beam intensity with higher electric field at the extraction electrode and be better ion supply stability for long periods, electric geometry and surface conditions of an extraction electrode have been studied. Focusing attention on black deposited substances on the...

A synthesis technology of endohedral fullerenes such as Fe@C60 has developed with an electron cyclotron resonance (ECR) ion source. The production of N@C60 was reported. However, the yield was quite low, since most fullerene molecules were broken in the ECR plasma. We have adopted gas-mixing techniques in order to cool the plasma and then reduce fu...

In this paper, we discuss the results of our study of the synthesis of endohedral iron-fullerenes. A low energy Fe(+) ion beam was irradiated to C60 thin film by using a deceleration system. Fe(+)-irradiated C60 thin film was analyzed by high performance liquid chromatography and laser desorption/ ionization time-of-flight mass spectrometry. We inv...

In the paper, the material science experiments, carried out recently using the Bio-Nano electron cyclotron resonance ion source (ECRIS) at Toyo University, are reported. We have investigated several methods to synthesize endohedral C60 using ion-ion and ion-molecule collision reaction in the ECRIS. Because of the simplicity of the configuration, we...

It still remains a crucial challenge to control actively the structures of carbon nanotubes (CNTs) such as the alignment, the area density, the diameter, the length, the chirality and the number of walls. Here, we synthesize an ultra dense forest of CNTs of a uniform internal diameter by the plasma enhanced chemical vapor deposition (PECVD) method...

Controlling actively the structures of carbon nanotubes such as the alignment, length, diameter, chirality and the number of walls still remains a crucial challenge. The properties of CNTs are highly structure sensitive and particularly dependent on the diameter and number of walls. In this brief communication, we synthesise monodisperse CoFe2O4 na...

(1) TEM images of nanoparticles (magnified version), (2) Distributions of the diameters of nanoparticles, (3) XRD analysis of CoFe2O4 particles, (4) EDS spectra of nanoparticles, (5) FTIR spectra of CoFe2O4 nanoparticles, (6) TEM images of CNTs (magnified version), (7) Distribution of the internal diameters of CNTs, (8) Diameter of nanoparticles af...

It still remains a crucial challenge to control actively the structures of carbon nanotubes (CNTs) such as the alignment, length, diameter, chirality, and the number of walls. The properties of CNTs are highly dependent on the structures. There is a strong demand for invention of some innovative methodology to precisely control the number of walls...

Multiply charged ions to be used prospectively are produced from solid pure material in an electron cyclotron resonance ion source (ECRIS). Recently a pure iron source is also required for the production of caged iron ions in the fullerene in order to control cells in vivo in bio-nano science and technology. We adopt directly heating iron rod by...

We synthesise diameter controlled vertically aligned CNTs by the plasma enhanced chemical vapour deposition (PECVD) method using premade iron oxide nanoparticles of uniform diameters. CNTs of 10 μm length are grown after a 10 minute PECVD operation. More than 95% of the CNTs are either double or triple walled.

Fullerene plasmas generated by pulse-modulated microwaves have been investigated under typical conditions at the Bio-Nano electron cyclotron resonance ion source. The effect of the pulse modulation is distinct from that of simply structured gases, and then the density of the fullerene plasmas increased as decreasing the duty ratio. The density for...

An electron cyclotron resonance ion source (ECRIS) is used to generate multicharged ions for many kinds of the fields. We have developed an evaporator by using induction heating method that can generate pure vapor from solid state materials in ECRIS. We develop the new matching and protecting circuit by which we can precisely control the temperatur...

We have developed an electron cyclotron resonance ion source apparatus, which is designed for the production of endohedral fullerene. In this study, we irradiated the Fe(+) beam to the C(60) thin film. We changed the experimental condition of the dose and the ion energy. We could observe the Fe + C(60) peak by analysis of the time-of-flight mass sp...

The beam transport of N(+) ion and C(60)(+) ion in the Bio-Nano ECRIS with min-B configuration was investigated based on the ion beam profiles. The N(+) beam could be focused under the low-beam current conditions. Also the C(60)(+) beam could be focused in spite of the large space-charge effect which will lead the divergence of the beam. We confirm...

We have developed a laser and focused ion beam (FIB) compound process for press mold dies of a micro lens array (MLA) and a micro needle array (MNA) in a glassy carbon (GC). The press mold die of the MLA was roughly fabricated by UV-YAG laser. After this process, we finished this surface by scanning FIB. As a result, higher accuracy and good roughn...

Vertically-aligned diameter-controlled carbon nanotubes (CNTs) are synthesised by the plasma enhanced chemical vapour deposition (PECVD) method using multi-layers of self-assembled catalytic ligand-coated iron oxide nanoparticles. We find that the mono-dispersed nanoparticles play a vital role for the production of diameter-controlled CNTs. A new g...

We developed the chemical vapor deposition (CVD) system in which the pulsed UV laser (a fourth-harmonic Nd:YAG laser, lambda = 266 nm, pulse width = 4.3 ns, repetition frequency = 10 Hz) can be introduced. This CVD system is based on the cold-wall thermal CVD. The substrate, on which the growth catalysts are deposited, can be heated by resistance h...

We demonstrate that the Co nanoparticles prepared by vacuum deposition on a surface-active liquid can be used as catalysts of single-walled carbon nanotube (SWCNT) growth using alcohol catalytic chemical vapor deposition method. These Co nanoparticles are embedded in the y-type zeolite powder. The Co nanoparticles used in this study is the highly e...

We are developing an ECRIS apparatus which is designed for the production of endohedral fullerenes. Our promising approaches to produce the endohedral fullerenes using the ECRIS are the ion-ion collision reaction of fullerenes and the other atom in their mixture plasma and simple ion implantation of atom into fullerene layer. In this study, we trie...

We have developed a growth system for carbon nanotubes (CNTs) based on an alcohol thermal chemical vapor deposition (A- CVD). This system, which is similar to a cold wall-type CVD system, has an additional tubular electric furnace. The additional furnace is installed at a gas inlet in order to heat the carbon source gas. In this study, we have inve...

We developed an electron cyclotron resonance ion source (ECRIS) for new materials production on nanoscale. Our main target is the endohedral fullerenes, which have potential in medical care, biotechnology, and nanotechnology. In particular, iron-encapsulated fullerene can be applied as a contrast material for magnetic resonance imaging or microwave...

Multicharged ions that are needed are produced from solid pure material with high melting point in an electron cyclotron resonance ion source. We develop an evaporator by using induction heating (IH) with multilayer induction coil, which is made from bare molybdenum or tungsten wire without water cooling and surrounding the pure vaporized material....

An electron cyclotron resonance ion source (ECRIS) has been designed and developed for a synthesis of new materials such as endohedral metallofullerenes. The plasma chamber diameter is 140 mm in order to produce large m/q ions, like singly charged C60 ions effectively. In this study, we examined the performance of our ECRIS by plasma measurements u...

The segregation of intrinsic ionic species of LiNbO3 during crystallization generates electromotive force (EMF) at the growth interface. The EMF was measured during the growth of LiNbO3 crystal doped with MgO, ZnO, ZrO2 and MnO2 in the concentration range from 0 to 12 mol% using a micro-pulling-down growth system. The influence of these impurities...

An electron cyclotron resonance ion source (ECRIS) has been developed for a synthesis of endohedral metallofullerenes. The ECRIS has a traditional minimum-B magnetic field and an 8-10 GHz traveling wave tube (TWT) amplifier as a microwave source. C60 plasmas have been generated at the first experiment. Many broken fullerenes C58 and C56 are observe...

A new electron cyclotron resonance ion source (ECRIS) has been constructed for synthesis of endohedral metallofullerenes. The main purpose of the ion source is to produce new biological and medical materials. The design is based on ECRIS for production of multicharged ion beams with a traditional minimum-B magnetic field. An 8-10 GHz traveling wave...

Single-walled carbon nanotubes (SWNTs) irradiated with laser were investigated by Raman spectroscopy. The intensity of D band related to defects increased with the laser irradiation. It should be noticed that the corresponding change was observed for G^- peak associated with metallic SWNTs that is related to the electron-phonon coupling w...

Radial breathing modes (RBMs) in resonance Raman spectra from single-walled carbon nanotubes (SWCNTs) on a SiO2/Si (001) substrate are studied between 25 and 720°C. A change in the relative intensity of each RBM peak with temperature is observed, which originates from the temperature dependence of the resonance condition of nanotubes. For 25°C, eac...

We investigate the chirality-resolved growth kinetics of single-walled carbon nanotubes (SWCNTs) by in-situ Raman spectroscopy. The SWCNTs are synthesized by ethanol CVD from Co nanoparticle catalysts with pre-defined size before the CVD process. The chirality-sensitive radial breathing mode (RBM) signals in Raman spectra are observed during the CV...

The defects in single-wall carbon nanotubes irradiated with a 248 nm pulsed excimer laser were studied using Raman spectroscopy. The thermal relaxation kinetics of the laser-induced defects was examined at sample temperatures from 296 to 698 K. Two relaxation processes are revealed; one is the fast process with an activation energy of 0.4 eV and th...

G band Raman spectra for DNA-wrapped single-wall carbon nanotubes (SWNTs) in aqueous solution and air have been investigated. The lower-frequency mode in the G band associated with semiconducting SWNTs is drastically suppressed by DNA-wrapping. In addition, the broad and asymmetric feature of the Breit–Wiger–Fano (BWF) line in the G band associated...

DNA-wrapped single-wall carbon nanotubes (DNA-SWNT hybrids) under various humidity conditions were investigated by Raman spectroscopy. The G band, especially Breit–Wigner–Fano (BWF) line, in the Raman spectra of DNA-SWNT hybrids strongly depends on the relative humidity. In the high humidity range above 55%, the BWF coupling increases with decreasi...

We show that diesel soot can be recycled as a carbon source for the synthesis of single-wall carbon nanotubes (SWNTs). The synthesis of SWNTs was carried out by the laser vaporization of diesel soot. The presence of SWNTs was confirmed by Raman spectroscopy and transmission electron microscopy. SWNTs produced in this way should provide economic ben...

We report the characterization of electrical properties for multi-walled carbon nanotubes (MWNTs) synthesized by the arc-discharge method, as to the difference of characteristics between two diameters of 10 nm and 100 nm. In a result of Raman spectrums, we have observed clear radial-breathing-mode peak at approximately 255 cm−1, which corresponds i...

Breit-Wigner-Fano (BWF) Raman line in DNA-wrapped single-wall carbon nanotubes (SWNTs) was investigated. For as-produced HiPco SWNT bundles, the asymmetric profile of BWF line is clearly observed with an excitation energy of 2.33 eV. The asymmetric feature almost disappears in isolated HiPco SWNTs by DNA wrapping in aqueous solution. Such a signifi...

Raman spectra of carbon nanowalls (CNWs) grown using dc plasma-enhanced chemical vapor deposition were analyzed. The Raman spectra of CNWs exhibited G and D bands at ∼ 1580 and ∼ 1350 cm−1, respectively. It is found that the bandwidth of the G band is relatively narrow, even when the peak intensity ratio of D band to G band is significantly high. T...

The G band in Raman spectra of single-wall carbon nanotube (SWNT) bundles is studied between 3 and 500 K. The G band is best fit with five Lorentzian lines and one Breit–Wigner–Fano (BWF) line, indicating coupling of phonons to the electronic continuum of metallic SWNTs. It is found that the line width of the BWF line decreases with increasing temp...

C60 nanowhiskers are grown by a liquid–liquid interfacial precipitation method at 21 °C. It is found that the growth of the nanowhiskers is promoted under illumination even with weak room light (fluorescent light). The maximum of their lengths exceeds 1 mm where the diameter is about 250 nm. From Raman scattering measurements, it is shown that C60...

We are developing a new electron cyclotron resonance ion source (ECRIS) for the synthesis of endohedral fullerenes, which have potential in medical care, biotechnology and nanotechnology. So this ion source is called Bio-Nano ECRIS. It has been reported that ions of fullerenes and carbons-loss fullerenes, such as C 60 + , C 58 + , …, are easily pro...

The characterization of crystal defects in protein crystals is very important for their technical applications. Laue topography using synchrotron radiation (SR) is one of the most powerful methods to characterize crystal defects because a large number of topographs with different reflections can be obtained by one short exposure. However, protein c...