Jun Natsuki

• Shinshu University

The development of flexible and compressible multifunctional sensors for integration into artificial intelligence systems represents a critical advancement in next-generation electronics. This study introduces a cost-effective method for fabricating a compressible, humidity-sensitive conductive sponge applied for dual pressure-humidity sensing. The...

Carbon nanotubes (CNTs) have attracted considerable attention as nanomechanical resonators because of their exceptional mechanical properties and nanoscale dimensions. In this study, a novel CNT-based probe is proposed as an efficient nanoforce sensing nanomaterial that detects external pressure. The CNT probe was designed to be fixed by clamping t...

Hydrogen is the most environmentally friendly and cleanest fuel that has the potential to supply most of the world's energy in the future, replacing the present fossil fuel-based energy infrastructure. Hydrogen is expected to solve the problem of energy shortages in the near future, especially in complex geographical areas (hills, arid plateaus, et...

As a renewable and low‐carbon emission energy source, water‐droplet‐based devices are attracting increasing interest. However, the uncertain mechanistic explanation, output shortage, and lack of storability remain huge barriers to their large‐scale applications. Herein, a compact quasi‐solid‐state electrolytic hydrocapacitor (HCelect) is successful...

Carbon-based nanomaterials, including carbon nanotubes (CNTs) and graphene sheets (GSs), have garnered considerable research attention owing to their unique mechanical, physical, and chemical properties compared with traditional materials. Nanosensors are sensing devices with sensing elements made of nanomaterials or nanostructures. CNT- and GS-bas...

This paper presents an analytical model and a closed-form solution for predicting buckling property of graphene nanoribbon (GNR) substrates with nano-coating layer. In the analytical model, the shear deformation and the nonlocal elasticity theory are considered to obtain high order differential governing equation for internal stress and deformation...

Hybrid nanocomposites of silver nanoparticles and multiwalled carbon nanotubes (AgNPs/MWCNTs) were successfully synthesized by a green one-step method without using any organic solvent. The synthesis and attachment of AgNPs onto the surface of MWCNTs were performed simultaneously by chemical reduction. In addition to their synthesis, the sintering...

Dynamic behaviors of double-walled carbon nanotubes (DWCNTs) embedded to elastic foundation under a moving nanoparticle are studied based on the nonlocal elasticity theory. The DWCNTs embedded an elastic medium are considered as two-scale shell model coupled with the van der Waals (vdW) interaction between two adjacent nanotubes. The elastic medium...

To prevent the heat generated by UV radiation from destroying the UV-shielding materials, zinc oxide/polyurethane composite membranes (ZnO/PU composite membranes) were synthesized via a simple solution casting method, where ZnO nanoparticles were firstly synthesized using a hydrothermal method with an eco-friendly reducing agent. Synthesized ZnO na...

To prevent CuNPs oxidation, we studied their interaction between graphene oxide (GO) sheets, forming [email protected] composites via a liquid-phase reduction method, and resulting sandwich structures. The limited GO interlayer distance controls the size of CuNPs (~ 10 nm diameter) during the reduction process. The large surface area of GO sheets p...

In this work, silver nanoparticles/graphene oxide nanoscroll composites (AgNPs/GO nanoscroll composites) with open-ended nanoscroll structures were synthesized as a recyclable photocatalyst. The open-ended nanoscroll structures provide sufficient space to prevent the AgNPs from oxidizing and aggregating, and the π-π continuous surface provides an a...

In this work, silver nanoparticles/graphene oxide nanoscroll composites (Ag/GO nanoscroll composites) were fabricated by a one-step method at room temperature. The GO sheets were cut into pieces by the silver nanoparticles (AgNPs) due to their catalytic activity, and then the GO pieces rolled up resulting from the intermolecular hydrogen bonds. Tra...

Composite structure of graphene sheet coated with nano film will be newly developed type structural materials. Hence, the mechanical properties of interface layer between graphene sheet and coating materials is crucial to fabricate the graphene nanoribbons (GNRs) when subjected to thermal loading. In present study, the thermal stress of GNRs with c...

In this study, an analytical model is proposed to investigate the sound transmission loss through multi-walled plates with air layers or decompression air layers, under the diffuse incidence field. Using the present approach, the influences of various parameters, such as the wall thickness, the decompressed air and the thickness of air space, on th...

The elastic modulus of nanowires can be measured by resonant frequency method, in which the elastic modulus is determined using the classical theory of beam deflection. However, the measurement accuracy of the elastic modulus obtained from the resonant frequency can be largely affected by theoretical models and boundary conditions. In the present p...

In using graphene sheets (GSs) to design nanoscale devices or nanostructure elements, it is very important to understand the properties of these elements against various mechanical loading conditions. The aim of this study is to investigate the impact response of double layer graphene sheets (DLGSs) on elastic foundations when they are subjected to...

Mechanical behaviors of nanomaterials are not easy to be evaluated in the laboratory because of their extremely small size and difficulty controlling. Thus, a suitable model for the estimation of the mechanical properties for nanomaterials becomes very important. In this study, the elastic properties of boron nitride (BN) nanosheets, including the...

In this study, the vibrational properties of single- and double-layer graphene sheets (GSs) with attached nanoparticles are analyzed based on the nonlocal elasticity theory. The potential applications of atomic-scale mass sensing are presented using GSs with simply supported boundary condition. The frequency equation for GSs with an attached nanopa...

We have developed a simple approach to synthesize silver nano-particles (AgNPs)/carbon nanotubes (CNTs) hybrid composites. First, AgNPs is fabricated by using chemical reducing agents. The resulting AgNPs by this procedure process are easily separated from the reaction mixture because of without using any organic solvent and external dispersing age...

In recent years, nanoparticles of noble metals such as gold, silver and palladium have drawn immense attention due to the wide range of new applications in various fields of industry. Particularly, silver nanoparticles have significant interest in medical applications such as very effective antibacterial agents without the toxic effects, and indust...

A convenient method to synthesize uniform, well-dispersed colloidal silver nanoparticles is described. Aldonic acid or α-hydroxy acid compounds of low molecular weight are used instead of polymeric compounds as dispersing agents to prepare silver nanoparticles. The size, conformation, and electrical conductivity of the silver nanoparticles, and the...

This paper describes a new method to prepare silver nanoparticles useful for printing electronic circuits. We have tried to develop a silver nitrate reduction method, with which a certain reducing agent has played an important role in the reduction of silver ions in an aqueous solution. The reduction has occurred rapidly at room temperature and the...

This paper describes a practical and convenient method to prepare stable colloidal silver nanoparticles for use in printed electronic circuits. The method uses a dispersant and two kinds of reducing agents including 2-(dimethylamino) ethanol (DMAE), which play important roles in the reduction of silver ions in an aqueous medium. The effect of DMAE...

We have been studying a method to prepare silver nanoparticles. At NIP26 we reported a new method to prepare silver nanoparticles of a diameter less than 10 nm with no organic solvent and complicated separation, in which amine compounds have the effect on the growth process of silver nanoparticles. In this study, the effect of dispersing agents suc...

This paper describes a new method to prepare silver nanoparticles being useful for printing electronic circuits. We have tried to develop a silver nitrate reduction method, where a certain reducing agent has played an important role in the reduction of silver ions in an aqueous solution. The reduction has occurred rapidly at room temperature and th...

Ectopic gene expression, or the gain-of-function approach, has the advantage that once the function of a gene is known the gene can be transferred to many different plants by transformation. We previously reported a method, called FOX hunting, that involves ectopic expression of Arabidopsis full-length cDNAs in Arabidopsis to systematically generat...

A practical and convenient method for discriminating between the presence and the absence of sialic acid in carbohydrate chains of glycoproteins was devised using paramagnetic beads and two lectins, Sambucus sieboldiana lectin (SSA) and Ricinus communis agglutinin (RCA120). The glycoproteins of transferrin or thyroglobulin were firstly captured to...

The lectin-antibody enzyme immunoassay of the alphafetoprotein-L3 carbohydrate chain, a tumor marker of liver cancer, has not been automated. We improved the technique of the assay for automation. Consequently, alphafetoprotein-L3 and total alphafetoprotein were detected with two lectins using an automatic paramagnetic bead handling robot. This ind...