scholarly journals Pt/CNT Micro-Nanorobots Driven by Glucose Catalytic Decomposition

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Hao Wang ◽  
Jiacheng Kan ◽  
Xin Zhang ◽  
Chenyi Gu ◽  
Zhan Yang
Keyword(s):  
Electron Microscope ◽  
Cathode Materials ◽  
Target Therapy ◽  
Drug Carrier ◽  
Pure Water ◽  
Chemical Vapor ◽  
Catalytic Decomposition ◽  
Viscous Force ◽  
Innovative Design ◽  
Transmission Electron

Swimming micro-nanorobots have attracted researchers’ interest in potential medical applications on target therapy, biosensor, drug carrier, and others. At present, the experimental setting of the swimming micro-nanorobots was mainly studied in pure water or H2O2 solution. This paper presents a micro-nanorobot that applied glucose in human body fluid as driving fuel. Based on the catalytic properties of the anode and cathode materials of the glucose fuel cell, platinum (Pt) and carbon nanotube (CNT) were selected as the anode and cathode materials, respectively, for the micro-nanorobot. The innovative design adopted the method of template electrochemical and chemical vapor deposition to manufacture the Pt/CNT micro-nanorobot structure. Both the scanning electron microscope (SEM) and transmission electron microscope (TEM) were employed to observe the morphology of the sample, and its elements were analyzed by energy-dispersive X-ray spectroscopy (EDX). Through a large number of experiments in a glucose solution and according to Stoker’s law of viscous force and Newton’s second law, we calculated the driving force of the fabricated micro-nanorobot. It was concluded that the structure of the Pt/CNT micro-nanorobot satisfied the required characteristics of both biocompatibility and motion.

Synthetics of ZnO Nanowires on GaN/Sapphire Substrate by Gold Catalyst

2011 ◽  
Vol 339 ◽  
pp. 3-6
Author(s):  
Chun Hua Xu ◽  
Kelvin Leung ◽  
Charles Surya
Keyword(s):  
Electron Microscope ◽  
Vapor Deposition ◽  
Gold Catalyst ◽  
Chemical Vapor ◽  
Zno Nanowires ◽  
Vapor Liquid Solid ◽  
Sapphire Substrates ◽  
Transmission Electron ◽  
Typical Length ◽  
Scanning Electron

ZnO nanowires were grown on Au-coated GaN layer on c-plane sapphire by chemical vapor deposition (CVD). As-prepared ZnO oxides were characterized by a scanning electron microscope (SEM) and a transmission electron microscope (TEM). The results show that the growth of ZnO nanowires strongly depends on the location of GaN/sapphire substrates. The diameters of the resulting nanowires were in the range 60 nm with typical length about 10μm. The formation of ZnO nanowires with different morphologies at various positions of the substrate is explained by the mechanisms of vapor-solid and vapor-liquid-solid, respectively.

Defect population and electrical properties of Ar+-laser crystallized polycrystalline silicon thin films

2000 ◽  
Vol 621 ◽  
Author(s):  
S. Christiansen ◽  
M. Nerding ◽  
C. Eder ◽  
G. Andrae ◽  
F. Falk ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Electrical Properties ◽  
Process Parameters ◽  
Continuous Wave ◽  
Chemical Vapor ◽  
Glass Substrates ◽  
Silicon Thin Films ◽  
Transmission Electron ◽  
Pressure Chemical ◽  
Convergent Beam

ABSTRACTWe crystallize amorphous silicon (a-Si) layers (thicknesses: ∼300nm and ∼1300nm for comparison) that are deposited on glass substrates (Corning 7059) by low pressure chemical vapor deposition using a continuous wave Ar+-laser. We scan the raw beam with a diameter of ∼60νm in single traces and traces with varying overlap (30-60%). With optimized process parameters (fluence, scan velocity, overlap) we achieve polycrystalline Si with grains as wide as 100νm. The grain boundary population is dominated by first and second order twin boundaries as analyzed by electron backscattering analysis in the scanning electron microscope and convergent beam electron diffraction in the transmission electron microscope. These twins are known not (or only marginally) to degrade the electrical properties of the material. In addition to twins, dislocations and twin lamellae occur at varying densities (depending on grain orientation and process parameters). The recombination activity of the defects is analyzed by EBIC and according to these measurements crystallization receipts are defined that yield the reduction of electrically detrimental defects.

The Effect of Temperature on the Structure of Cotton Carbon Fiber by Chemical Vapor Deposition

2015 ◽  
Vol 781 ◽  
pp. 671-674
Author(s):  
Jindamanee Nissayan ◽  
Saifon Kruehong ◽  
Chaiyaput Kruehong ◽  
Apichat Artnaseaw
Keyword(s):  
Chemical Vapor Deposition ◽  
Electron Microscope ◽  
Carbon Fibers ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Average Diameter ◽  
Effect Of Temperature ◽  
Synthesis Process ◽  
Transmission Electron ◽  
Different Temperatures

Synthesis of carbon fibers of cotton by chemical vapor deposition (CDV) method is the main focus of this study. Having ferocene as the catalyst, the study explored effects of synthesis process at different temperatures (750°C, 850°C and 950°C). Analysis of size, shape and structure were conducted using scanning electron microscope (SEM), transmission electron microscope (TEM) and Raman spectroscope. The result showed that average diameter of carbon fibers tended to increase according to temperature. In addition, it was found that surface of the fiber is bend and helical. Also, higher temperature affected graphitic of the fiber.

Rapid Structural Improvement of CVD-Grown Multi-Walled Carbon Nanotubes by Drastic Thermite Reaction

NANO ◽  
2015 ◽  
Vol 10 (08) ◽  
pp. 1550112
Author(s):  
Jiang Zhao ◽  
Jing Chen ◽  
Pengcheng Zhang ◽  
Haofeng Yu ◽  
Jie Chen
Keyword(s):  
Carbon Nanotubes ◽  
Electron Microscope ◽  
Electric Fields ◽  
Chemical Vapor ◽  
Reaction Process ◽  
Thermite Reaction ◽  
Structural Improvement ◽  
Transmission Electron ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Multi-walled carbon nanotubes (MWCNTs) produced by chemical vapor deposition (CVD) are the most common commercial products at extremely low price in the market. However, due to the inherent drawbacks of CVD surroundings at temperature below [Formula: see text][Formula: see text]1000[Formula: see text]C, CVD-grown nanotubes usually have very disordered structure, resulting in most of their properties being much below expectations. Herein, we present a simple and energy-efficient method for improving rapidly the structure of CVD-grown MWCNTs via a drastic thermite reaction process. Direct observations from scan electron microscope (SEM) and transmission electron microscope (TEM) images, decrease of [Formula: see text] ratios in Raman spectra, increase of the starting oxidation temperatures observed in thermogravimetric analysis (TGA), decrease of the volumetric electrical resistivity and decrease of the turn-on electric fields from 3.64 to 2.88[Formula: see text]V/[Formula: see text]m in field emission measurements suggest that the graphitization of MWCNTs can be effectively enhanced and the structure of nanotubes becomes more ordered after the drastic thermite reaction process.

scholarly journals Synthesis of Y-Tip Graphitic Nanoribbons from Alcohol Catalytic Chemical Vapor Deposition on Piezoelectric Substrate

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Zainab Yunusa ◽  
Suraya Abdul Rashid ◽  
Mohd Nizar Hamidon ◽  
Syed Hafiz ◽  
Ismayadi Ismail ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Chemical Vapor Deposition ◽  
Electron Microscope ◽  
Vapor Deposition ◽  
Direct Synthesis ◽  
Chemical Vapor ◽  
Catalytic Chemical Vapor Deposition ◽  
X Ray ◽  
Transmission Electron ◽  
Piezoelectric Substrate

We report the synthesis of Graphitic Nanoribbons (GNRs) using Alcohol Catalytic Chemical Vapor Deposition (ACCVD). Bulk GNR was synthesized directly on a piezoelectric substrate using one-step ACCVD. The synthesized GNRs were characterized by X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM), Transmission Electron Microscope (TEM), Energy Dispersive X-Ray (EDX), Atomic Force Microscopy (AFM), and Raman spectroscopy. The characterization results showed Y-tip morphology of bulk and filamentous as-grown GNR having varying width that lies between tens and hundreds of nm and length of several microns. Based on the thickness obtained from the AFM and the analysis from the Raman spectroscopy, it was concluded that the synthesized GNRs are multiple-layered and graphitic in nature. With the direct synthesis of GNR on a piezoelectric substrate, it could have applications in the sensor industries, while the Y-tip GNR could have potentialities in semiconductor applications.

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