Internal Stress Actuated Micro- and Nanomachines for Testing Physical Properties Of Micro and Nano-Sized Material Samples.

• US 20100224006A1
• Filed: 02/14/2007
• Published: 09/09/2010
• Est. Priority Date: 02/14/2006
• Status: Abandoned Application

• Current Assignee: Université catholique de Louvain
• Original Assignee: Université catholique de Louvain
• Inventors: Raskin, Jean-Pierre, Coulombier, Michaël, Fabrégue, Damien, André, Nicolas, Pardoen, Thomas
• Application Number:
  US12/223,921
• Publication Number:
  US 20100224006A1
• Time in Patent Office: Days
• US Class Current: 73/826
• CPC Class Codes: G01L 5/0047 measuring forces due to residual stresses
• CPC Class Codes: G01L 5/18 for measuring ratios of force
• CPC Class Codes: Y10T 29/4913 Assembling to base an electrical component, e.g., capacitor, etc.
• CPC Class Codes: Y10T 29/49865 by temperature differential [e.g., shrink fit]

Abstract

This invention provides an internal stress actuated micro- or nano-machine for measuring mechanical and/or electrical properties, e.g. traction measurement, compression measurement or shear measurement, on micro-scale and nano-scale films or multi-layers of materials such as metallic materials, carbon-based materials and silicon-base materials. The device of the invention has applications in materials production industry, as well as in micro-electronics and for surface treatments and functionalization.

Claims

1-45. -45. (canceled)

46. A micro- or nano-tensometer for measuring one or more mechanical and/or electromechanical and/or opticomechanical, and/or chemico-mechanical and/or thermomechanical properties on a micro- or nano-size material sample, said micro- or nano-tensometer comprising a substrate, and an actuator for connecting to said micro- or nano-size material sample, wherein internal stress present in said actuator provides, after chemical and/or physical release, a deformation of said micro- or nano-size material sample from which said mechanical and/or electromechanical and/or opticomechanical, and/or chemico-mechanical and/or thermomechanical properties of the micro- or nano-size material sample can be determined.

47. The micro- or nano-tensometer according to claim 46, wherein said actuator comprises an actuating material selected from the group consisting of silicon nitride, tungsten carbide, aluminium oxide, iron, copper, aluminium nitride, silicon carbide, tungsten, boron carbide and titanium.

48. The micro- or nano-tensometer according to claim 46, wherein said substrate comprises one or more materials selected from the group consisting of silicon, alumina, germanium, glass, ceramic, organic polymer, group III-V materials and metal.

49. The micro- or nano-tensometer according to claim 46, wherein the micro- or nano-size material sample to be tested is a thin aluminium film, is silicon-based, is carbon based or is a polymer.

50. The micro- or nano-tensometer according to claim 46, wherein the chemical and/or physical release is effected by means of etching.

51. The micro- or nano-tensometer according to claim 46, wherein the chemical and/or physical release is effected by one or more etching means selected from the group consisting of fluorhydric acid with a concentration from about 25% to about 85%, TMAH-based solution, plasma, H₂0₂ based solution and HNA solutions.

52. The micro- or nano-tensometer according to claim 46, wherein one or more dimensions of the micro- or nano-size material sample to be tested is from about 1 nm to about 5 μ

m.

53. The micro- or nano-tensometer according to claim 46, wherein the actuator, the substrate, and the micro- or nano-size material sample to be tested are arranged for traction measurement, for compression measurement or for shear measurement.

54. The micro- or nano-tensometer according to claim 46, wherein the section of said actuator varies along its length.

55. The micro- or nano-tensometer according to claim 54, wherein said actuator comprises at least two uniform portions of different sections.

56. The micro- or nano-tensometer according to claim 46 further comprising a sacrificial layer in contact with the actuator, the material sample and the substrate material.

57. The micro- or nano-tensometer according to claim 46 further comprising one or more means for applying additional stress on said micro- or nano-size material sample to be tested.

58. The micro- or nano-tensometer according to claim 57, wherein said one or more means for applying additional stress are means selected from the group consisting of electrostatic means, magnetic means, mechanical means or thermal means.

59. The micro- or nano-tensometer according to claim 46 wherein the micro- or nano-size material sample to be tested is connected to both the actuator and the substrate.

60. The micro- or nano-tensometer according to claim 46 wherein said internal stress is of thermal, growth or mechanical origin.

61. A method for measuring one or more mechanical and/or electromechanical and/or optiomechanical, and/or chemico-mechanical and/or thermomechanical properties on a micro- or nano-size material sample, comprising the steps of:

providing one or more elementary micro- or nano-tensometer, each comprising an actuator involving internal stresses, a material sample to be tested and a substrate, wherein in each of said one or more micro- or nano-tensometers, the material sample to be tested is connected to both the actuator and the substrate,

releasing chemically and/or physically said material sample to be tested and said actuator in each of said one or more micro- or nano-tensometers,

measuring the displacement of the material sample to be tested and/or an electric current through the material to be tested and/or an optical signal from or through the sample to be tested and/or a physico-chemical state of the material to be tested in each of said one or more micro- or nano-tensometer, and

determining from said displacement and/or electric current and/or optical signal and/or physico-chemical state the one or more mechanical and/or electromechanical and/or opticomechanical, and/or chemico-mechanical and/or thermomechanical properties of the micro- or nano-size material sample,

wherein said releasing comprises releasing internal stress in the actuator for providing a deformation of the micro- or nano-size material sample.

62. The method for measuring a mechanical property according to claim 61 further comprising the step of applying one or more additional stresses on said micro- or nano-size material sample.

63. A method for manufacturing a micro- or nano-tensometer for measuring one or more mechanical and/or electromechanical and/or opticomechanical, and/or chemico-mechanical and/or thermomechanical properties on a micro- or nano-size material sample, said micro- or nano-tensometer comprising a substrate, and an actuator for connecting to said micro- or nano-size material sample, wherein internal stress present in said actuator provides, after chemical and/or physical release, a deformation of said micro- or nano-size material sample from which said mechanical and/or electromechanical and/or opticomechanical, and/or chemico-mechanical and/or thermomechanical properties of the micro- or nano-size material sample can be determined, the method comprising the steps of:

a) providing a substrate at a first temperature,

b) connecting an actuator to said substrate at a second temperature,

c) connecting a micro or nano-material sample to be tested to said substrate and to said actuator at a third temperature,

wherein said first, second and third temperatures are different or the same.