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Related Concept Videos

Noble Gases02:54

Noble Gases

22.8K

The elements in group 18 are noble gases (helium, neon, argon, krypton, xenon, and radon). They earned the name “noble” because they were assumed to be nonreactive since they have filled valence shells. In 1962, Dr. Neil Bartlett at the University of British Columbia proved this assumption to be false.
22.8K
Alkali Metals03:06

Alkali Metals

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Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
24.9K
Atomic Radii and Effective Nuclear Charge03:08

Atomic Radii and Effective Nuclear Charge

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The elements in groups of the periodic table exhibit similar chemical behavior. This similarity occurs because the members of a group have the same number and distribution of electrons in their valence shells.
62.2K
Metallic Solids02:37

Metallic Solids

20.8K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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Bonding in Metals02:32

Bonding in Metals

52.6K
Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
52.6K
Atomic Structure01:33

Atomic Structure

210.3K
Overview
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Atom Probe Tomography Analysis of Exsolved Mineral Phases
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Dual Probe Sensors Using Atomically Precise Noble Metal Clusters.

Vidhya Subramanian1, Sanjoy Jena1, Debasmita Ghosh1

  • 1DST Unit of Nanoscience (DSTUNS) and Thematic Unit of Excellence (TUE), Department of Chemistry, Department of Biotechnology, and Department of Electrical Engineering, Indian Institute of Technology Madras, Chennai 600036, India.

ACS Omega
|July 20, 2018
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel dual probe sensor using gold clusters on nanofibers for detecting trinitrotoluene (TNT). This highly sensitive sensor measures both luminescence and conductivity changes, offering a new direction in chemical sensing technology.

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Area of Science:

  • Nanomaterials Science
  • Chemical Sensing
  • Biomedical Engineering

Background:

  • Protein-protected atomically precise gold clusters exhibit intense luminescence.
  • Amino acids possess electron-donating properties, influencing cluster behavior.
  • Nanofibers are extensively researched for sensor fabrication.

Purpose of the Study:

  • To introduce a dual probe sensor utilizing luminescence and conductivity.
  • To develop a hybrid nanofiber with a conducting core and porous dielectric shell.
  • To detect trace quantities of trinitrotoluene (TNT) using gold clusters on nanofibers.

Main Methods:

  • Fabrication of a hybrid nanofiber with a conducting core and porous dielectric shell.
  • Immobilization of bovine serum albumin-protected atomically precise gold clusters on the hybrid nanofibers.
  • Detection of TNT in solution and vapor phases by monitoring luminescence and conductivity changes.

Main Results:

  • The dual probe sensor demonstrated high selectivity and sensitivity for TNT detection.
  • Detection limit in solution phase: 1 part per trillion (ppt) at room temperature.
  • Detection limit in vapor phase: 4.8 × 10^9 molecules of TNT using a 1 mm fiber.

Conclusions:

  • The developed hybrid nanofiber platform with gold clusters offers a novel approach for dual-mode sensing.
  • This technology provides a highly sensitive and selective method for detecting trace amounts of TNT.
  • The combination of luminescence and conductivity sensing in a single platform represents a significant advancement in sensor technology.