Modulation of Conductivity and Contact Resistance of RuO2 Nanosheets via Metal Nano-Particles Surface Decoration

We studied the variation in electrical conductivity of exfoliated RuO2 nanosheets and the modulation in the contact resistance of individual nanosheet devices using charge transfer doping effects based on surface metal nanoparticle decorations. The electrical conductivity in the monolayer and bilayer RuO2 nanosheets gradually increased due to the surface decoration of Cu, and subsequently Ag, nanoparticles. We obtained contact resistances between the nanosheet and electrodes using the four-point and two-point probe techniques. Moreover, the contact resistances decreased during the surface decoration processes. We established that the surface decoration of metal nanoparticles is a suitable method for external contact engineering and the modulation of the internal properties of nanomaterials.

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Formation and Evaluation of Silicon Substrate with Highly-Doped Porous Si Layers Formed by Metal-Assisted Chemical Etching

Nanoscale Research Letters ◽

10.1186/s11671-021-03524-z ◽

2021 ◽

Vol 16 (1) ◽

Author(s):

Yijie Li ◽

Nguyen Van Toan ◽

Zhuqing Wang ◽

Khairul Fadzli Bin Samat ◽

Takahito Ono

Keyword(s):

Electrical Conductivity ◽

Seebeck Coefficient ◽

Contact Resistance ◽

Power Factor ◽

Chemical Etching ◽

Porous Si ◽

Si Substrate ◽

Si Substrates ◽

Output Performance ◽

Metal Assisted Chemical Etching

AbstractPorous silicon (Si) is a low thermal conductivity material, which has high potential for thermoelectric devices. However, low output performance of porous Si hinders the development of thermoelectric performance due to low electrical conductivity. The large contact resistance from nonlinear contact between porous Si and metal is one reason for the reduction of electrical conductivity. In this paper, p- and n-type porous Si were formed on Si substrate by metal-assisted chemical etching. To decrease contact resistance, p- and n-type spin on dopants are employed to dope an impurity element into p- and n-type porous Si surface, respectively. Compared to the Si substrate with undoped porous samples, ohmic contact can be obtained, and the electrical conductivity of doped p- and n-type porous Si can be improved to 1160 and 1390 S/m, respectively. Compared with the Si substrate, the special contact resistances for the doped p- and n-type porous Si layer decreases to 1.35 and 1.16 mΩ/cm2, respectively, by increasing the carrier concentration. However, the increase of the carrier concentration induces the decline of the Seebeck coefficient for p- and n-type Si substrates with doped porous Si samples to 491 and 480 μV/K, respectively. Power factor is related to the Seebeck coefficient and electrical conductivity of thermoelectric material, which is one vital factor that evaluates its output performance. Therefore, even though the Seebeck coefficient values of Si substrates with doped porous Si samples decrease, the doped porous Si layer can improve the power factor compared to undoped samples due to the enhancement of electrical conductivity, which facilitates its development for thermoelectric application.

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A monochromatic recursive convolution finite-difference time-domain algorithm and its application in simulation of arrays of metal nano-particles

10.1117/12.2022412 ◽

2013 ◽

Author(s):

Saswatee Banerjee

Keyword(s):

Finite Difference ◽

Time Domain ◽

Finite Difference Time Domain ◽

Nano Particles ◽

Metal Nano Particles ◽

Difference Time ◽

Recursive Convolution

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Silicon Micro-Photonic Structure for Ultra-Sensitive Biosensing

MRS Proceedings ◽

10.1557/proc-797-w1.9 ◽

2003 ◽

Vol 797 ◽

Author(s):

Bradley Schmidt ◽

Vilson Almeida ◽

Christina Manolatou ◽

Stefan Preble ◽

Michal Lipson

Keyword(s):

Nano Particles ◽

Particle Detection ◽

Strong Light ◽

Extinction Cross Section ◽

Low Concentrations ◽

Silicon Photonic ◽

Micron Size ◽

Planar Silicon ◽

Single Particle Detection ◽

Metal Nano Particles

ABSTRACTWe demonstrate a micron-size planar silicon photonic device that is able to detect low concentrations of metal nano-particles approaching single particle detection. This sensitivity is achieved by using strong light confining structures that enhance the extinction cross-section of metal nano-particles by orders of magnitude. Structures were fabricated and measurements of the transmission spectra of the devices demonstrate the detection of 10 nm diameter gold particles resting on the device with a density of fewer than 2 particles per 104 nm2 (the area of the sensing region surface). Using such a device, in a fluidic platform, one could detect the presence of a single metal nano-particle specifically bound to various analytes, enabling ultrasensitive detection of analytes including DNA, RNA, proteins, and antigens.

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Synthesis of Noble Metal Nano-particles in Supercritical Fluids

The Review of High Pressure Science and Technology ◽

10.4131/jshpreview.20.11 ◽

2010 ◽

Vol 20 (1) ◽

pp. 11-18

Author(s):

Yoshifumi KIMURA ◽

Masafumi HARADA

Keyword(s):

Noble Metal ◽

Supercritical Fluids ◽

Nano Particles ◽

Metal Nano Particles

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Metal nano-particles sizing by thermal annealing for the enhancement of surface plasmon effects in thin-film solar cells application

Optics Communications ◽

10.1016/j.optcom.2016.03.009 ◽

2016 ◽

Vol 370 ◽

pp. 85-90 ◽

Cited By ~ 20

Author(s):

Li-Zen Hsieh ◽

Yuan-Fong Chou Chau ◽

Chee Ming Lim ◽

Mo-Hua Lin ◽

Hung Ji Huang ◽

...

Keyword(s):

Thin Film ◽

Solar Cells ◽

Thermal Annealing ◽

Surface Plasmon ◽

Nano Particles ◽

Thin Film Solar Cells ◽

Metal Nano Particles

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Metal nano-particles modernized layers and those with polymers for laser thermonuclear targets

Journal of Physics Conference Series ◽

10.1088/1742-6596/907/1/012018 ◽

2017 ◽

Vol 907 ◽

pp. 012018

Author(s):

I V Akimova ◽

A A Akunets ◽

N G Borisenko ◽

S Chaurasia ◽

A I Gromov ◽

...

Keyword(s):

Nano Particles ◽

Metal Nano Particles

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Preparation and Application of Metal Nanoparticals Elaborated Fiber Sensors

Sensors ◽

10.3390/s20185155 ◽

2020 ◽

Vol 20 (18) ◽

pp. 5155

Author(s):

Jin Li ◽

Haoru Wang ◽

Zhi Li ◽

Zhengcheng Su ◽

Yue Zhu

Keyword(s):

Optical Fiber ◽

Ph Value ◽

Hot Spot ◽

Incident Light ◽

Environmental Parameters ◽

Optical Diffraction ◽

Nano Particles ◽

Physical Parameters ◽

Compact Structure ◽

Metal Nano Particles

In recent years, surface plasmon resonance devices (SPR, or named plamonics) have attracted much more attention because of their great prospects in breaking through the optical diffraction limit and developing new photons and sensing devices. At the same time, the combination of SPR and optical fiber promotes the development of the compact micro-probes with high-performance and the integration of fiber and planar waveguide. Different from the long-range SPR of planar metal nano-films, the local-SPR (LSPR) effect can be excited by incident light on the surface of nano-scaled metal particles, resulting in local enhanced light field, i.e., optical hot spot. Metal nano-particles-modified optical fiber LSPR sensor has high sensitivity and compact structure, which can realize the real-time monitoring of physical parameters, environmental parameters (temperature, humidity), and biochemical molecules (pH value, gas-liquid concentration, protein molecules, viruses). In this paper, both fabrication and application of the metal nano-particles modified optical fiber LSPR sensor probe are reviewed, and its future development is predicted.

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