Advancement in fabrication of carbon nanotube tip for atomic force microscope using multi-axis nanomanipulator in scanning electron microscope

2022 ◽  
Author(s):  
Sanjeev Kumar Kanth ◽  
Anjli Sharma ◽  
Byong Chon Park ◽  
Woon Song ◽  
Hyun Rhu ◽  
...  
Keyword(s):  
Electron Beam ◽  
Electron Microscope ◽  
Carbon Nanotube ◽  
Scanning Electron Microscope ◽  
Atomic Force Microscope ◽  
Structural Integrity ◽  
Ion Beam ◽  
Rectilinear Motion ◽  
Atomic Force ◽  
Scanning Electron

Abstract We have constructed a new nanomanipulator (NM) in a field emission scanning electron microscope (FE-SEM) to fabricate carbon nanotube (CNT) tip to precisely adjust the length and attachment angle of CNT onto the mother atomic force microscope (AFM) tip. The new NM is composed of 2 modules, each of which has the degree of freedom of three-dimensional rectilinear motion x, y and z and one-dimensional rotational motion θ. The NM is mounted on the stage of a FE-SEM. With the system of 14 axes in total which includes 5 axes of FE-SEM and 9 axes of nano-actuators, it was possible to see CNT tip from both rear and side view about the mother tip. With the help of new NM, the attachment angle error could be reduced down to 0º as seen from both the side and the rear view, as well as, the length of the CNT could be adjusted with the precision using electron beam induced etching. For the proper attachment of CNT on the mother tip surface, the side of the mother tip was milled with focused ion beam. In addition, electron beam induced deposition was used to strengthen the adhesion between CNT and the mother tip. In order to check the structural integrity of fabricated CNT, transmission electron microscope image was taken which showed the fine cutting of CNT and the clean surface as well. Finally, the performance of the fabricated CNT tip was demonstrated by imaging 1-D grating and DNA samples with atomic force microscope in tapping mode.

The Nano Membrane-Like Structure of the Precambrian Microfossils under Atomic Force Microscope (AFM)

2007 ◽  
Vol 121-123 ◽  
pp. 739-742 ◽  
Author(s):  
H.M. Chi ◽  
Z.D. Xiao ◽  
Xin Xing Xiao
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Atomic Force Microscope ◽  
Early Life ◽  
Three Dimensional ◽  
New Method ◽  
Subcellular Structure ◽  
Atomic Force ◽  
Fossil Embryos ◽  
Scanning Electron

Weng`an fauna in Guizhou, China provides a unique window for the evolution of the early life especially since the animal embryos and sponge is found there. Phosphatization makes the fossils preserve in details including cells and subcellular structure. Here we use atomic force microscope observing the surface of some three dimensional preserved embryo fossils and the ultra membrane-like structure is found under atomic force microscope (AFM) while such structure can`t be found under scanning electron microscope (SEM). The membrane-like structure is approximately 10nm in thickness which maybe one part of the fossil embryos or belong to another nano scale microfossils. Therefore, AFM provides a new method for the study of the ultra structure of the microfossils from Weng`an fauna.

Calibration of Carbon Nanotube Probes for Pico-Newton Order Force Measurement Inside a Scanning Electron Microscope

2004 ◽  
Vol 16 (2) ◽  
pp. 155-162 ◽  
Author(s):  
Masahiro Nakajima ◽  
◽  
Fumihito Arai ◽  
Lixin Dong ◽  
Toshio Fukuda
Keyword(s):  
Electron Microscope ◽  
Carbon Nanotube ◽  
Scanning Electron Microscope ◽  
Elastic Moduli ◽  
Force Measurement ◽  
Ultrasonic Waves ◽  
Copper Electrodes ◽  
Atomic Force ◽  
Afm Cantilever ◽  
Scanning Electron

A method is presented for pico-Newton (pN) order force measurement using a carbon nanotube (CNT) probe, which is calibrated by electromechanical resonance. A CNT probe is constructed by attaching a CNT to the end of a tungsten needle or an atomic force microscope (AFM) cantilever using nanorobotic manipulators inside a field-emission scanning electron microscope (FE-SEM). Conductive electron-beam-induced deposition (EBID) is used for the fixation of CNTs with an internal vaporized precursor W(CO)6. For manipulating them easily and quickly, CNTs are dispersed in ethanol by ultrasonic waves and oriented on copper electrodes by electrophoresis. The elastic moduli of CNT probes are calibrated for use as a force measurement probe by electrically exciting at fundamental frequency. We analyzed the resolution of force measurement using a CNT probe. This force measurement can be used to characterize the mechanical properties of nanostructures and to measure friction or exfoliation forces in nanometer order.

scholarly journals Preparation and characterization of a novel bacterial cellulose/chitosan bio-hydrogel

2017 ◽  
Vol 7 ◽  
pp. 184798041770717 ◽  
Author(s):  
Yuanyuan Jia ◽  
Xiaohong Wang ◽  
Mingming Huo ◽  
Xiaoli Zhai ◽  
Fei Li ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Atomic Force Microscope ◽  
Bacterial Cellulose ◽  
Crystallinity Index ◽  
Growth Media ◽  
Published Data ◽  
Gravimetric Analysis ◽  
Atomic Force ◽  
Scanning Electron

Composites of chitosan chloride and bacterial cellulose were successfully prepared by in situ method. Composites of bacterial cellulose/chitosan and pristine bacterial cellulose were investigated by means of scanning electron microscope, atomic force microscope, Fourier transform infrared spectroscopy, thermogravimetric analysis, X-ray diffraction, and bacteriostatic test. The crystallization of bacterial cellulose was interfered and weakened by the chitosan chloride included in the growth media, resulting in lower crystallinity index and thermal stability. And interaction between two polymers is verified by the thermal gravimetric analysis. The ultrafine nanofibril network structure of bacterial cellulose was retained by the composites, while the diameters were larger and the aperture inside were smaller than those of pristine bacterial cellulose, as shown through scanning electron microscope and atomic force microscope figures. The antimicrobial effects were enhanced by the increasing concentration of chitosan in composites. All the characteristics of the composites provide evidence for the miscibility of chitosan and cellulose. Their biocompatibility is proved through our published data. It is strongly indicated that bacterial cellulose–chitosan nanocomposites have great potential in tissue engineering or pharmaceutical applications in the near future.

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