Method for achieving optical visualization of low-dimensional nanomaterials

A low-dimensional nanometer and nanomaterial technology, applied in the field of nanomaterial characterization, can solve problems such as narrow scope of application, complex methods and equipment, and no visualization of nanomaterials

Active Publication Date: 2015-12-16
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, HuangSM et al. (HuangSH, QianY, etal.J.Am.Chem.Soc.2008,130,11860–11861) achieved optical visualization of single-walled carbon nanotubes by electrochemically depositing silver particles, but in the liquid phase and it is necessary to make electrodes on carbon nanotubes; ZhangRF et al. (ZhangRF, ZhangYY, etal.Nat.Commun., 2013,4,1727) realized optical observation of carbon nanotubes by means of chemical vapor deposition of titanium dioxide, etc., but this method is applicable The range is very narrow, and it is only effective for suspended carbon nanotubes, but in practical applications, it is mainly carbon nanotubes on the surface of the substrate. In addition, titanium dioxide is not easy to remove, which affects the subsequent characterization and application of materials; WangJT et al. (WangJT, LiTY, et al.NanoLett .2014, 14, 3527-3533) used the method of water vapor condensation to realize the optical visualization of carbon nanotubes on the substrate, but because the tiny water droplets evaporate easily at room temperature, the visualization time is short, and this method is only applicable to the surface of the substrate. Carbon nanotubes, not valid for suspended carbon nanotubes
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  • Method for achieving optical visualization of low-dimensional nanomaterials
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  • Method for achieving optical visualization of low-dimensional nanomaterials

Examples

Experimental program
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Example Embodiment

[0041] Example 1. Optical visualization of single carbon nanotubes on silica / silicon substrates using sublimated sulfur

[0042] The specific process such as figure 1 As shown, the horizontal array of ultra-long carbon nanotubes grown on a silicon dioxide / silicon substrate was prepared first, and then the sublimated sulfur was heated to 120 °C by a heating stage, and after the temperature stabilized, the substrate with the carbon nanotubes was turned upside down Above the sublimated sulfur, remove it after 5 minutes, and then observe it with an optical microscope.

[0043] The optical photos of the sublimated sulfur-supported carbon nanotubes prepared in this example are as follows: figure 2 As shown in the optical photos, scanning electron microscope photos, and atomic force microscope photos, the sublimated sulfur is effectively supported on the carbon nanotubes, and the optical visualization of the carbon nanotubes on the silica / silicon substrate is achieved.

[0044] In...

Example Embodiment

[0046] Example 2. Optical visualization of suspended carbon nanotubes using sublimated sulfur

[0047] The specific process flow is the same as that of Example 1. In this example, a substrate with slits is selected to grow carbon nanotubes. The carbon nanotubes are in a suspended state at the slits, and the suspended carbon nanotubes are helpful for subsequent controllable manipulations. The substrate on which the suspended carbon nanotubes were grown was placed above the sublimation sulfur at 120 °C, the load time was 5 min, and the sample was removed for observation.

[0048] The optical photos of the sublimated sulfur-supported suspended carbon nanotubes prepared in this example are as follows: Figure 4 It can be seen from the optical photos and scanning electron microscope photos that the sublimated sulfur is effectively loaded on the suspended carbon nanotubes, and the optical visualization of the suspended carbon nanotubes is realized.

[0049] The suspended carbon nan...

Example Embodiment

[0050] Example 3. Optical visualization of pure silicon-based carbon nanotubes using sublimated sulfur

[0051] The specific process flow is the same as in Example 1. First, prepare a horizontal array of ultra-long carbon nanotubes grown on a pure silicon substrate, and then heat the sublimated sulfur to 120°C through a heating table. The pure silicon substrate was placed upside down on the sublimed sulfur, and removed after 5 minutes, and then the optical microscope could be used for observation.

[0052] The optical photos of the sublimated sulfur-supported carbon nanotubes prepared in this example are as follows: Figure 5 It can be seen from the optical photos that the sublimated sulfur is effectively supported on the carbon nanotubes, and the optical visualization of the carbon nanotubes on the pure silicon substrate is achieved.

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Abstract

The invention discloses a method for achieving optical visualization of low-dimensional nanomaterials, and one or more sublimable/volatile markers are deposited on the nanomaterials. The method comprises the following steps: the marker is placed in a vessel, and is heated in the atmospheric environment; a substrate containing the low-dimensional nanomaterials is placed above the marker, and the marker is deposited on the nanomaterials, and the substrate is taken down and observed by utilizing an optical microscope. The marker is selected from one or more of sublimed sulfur, metallo-organic compound, inorganic ammonium salt, carbamide, ammonium persulfate, paraffin or fatty acid. Compared with the prior art, the method is simple and high in applicability and controllability, the low-dimensional nanomaterials do not need to be pretreated, and the location of the nanomaterials under a common optical microscope is realized; the laboratory investigation and industrial manufacture as well as application of the nanomaterials are greatly convenient; the adopted marker can be controllably removed, pollution and destruction of nanomaterials do not exist, and the later use of the nanomaterials is not influenced.

Description

technical field [0001] The invention relates to a method for realizing direct observation of low-dimensional nanomaterials under an ordinary optical microscope or even naked eyes, and belongs to the technical field of nanomaterial characterization. Background technique [0002] Nanomaterials refer to materials with at least one dimension in the nanoscale range (1-100nm) in the microstructure or composed of them as basic units, and have been developed rapidly since the 1980s. Nanomaterials have unique structures and excellent properties such as force, electricity, heat, magnetism, and light, and have broad application prospects in nanoelectronic devices, biosensors, and optical devices. One-dimensional nanomaterials mainly include nanowires, nanotubes, nanobelts, nanorods, etc.; two-dimensional nanomaterials mainly include nanofilms, such as graphene. The development of nanomaterials has promoted and improved corresponding characterization techniques, such as scanning electr...

Claims

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Application Information

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IPC IPC(8): G01N21/00
Inventor 张莹莹蹇木强
Owner TSINGHUA UNIV
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