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Properties of Transition Metals

Properties of Transition Metals

Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.

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Related Experiment Video

Updated: Jun 3, 2025

Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model

Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model

Published on: May 23, 2018

W/Mo/Cr Doping Modulates the Negative-Positive Inversion Gas Sensing Behavior of VO₂(M1).

Lei Miao¹, Yibei Xue¹, Peng Song¹

¹Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, Sendai 980-8577, Japan.

|January 9, 2025

Summary

This summary is machine-generated.

Element doping in Vanadium Dioxide (VO2) modulates gas sensing behavior. Doping with W, Mo, or Cr induces inversion sensing, offering new insights into gas sensor theory and material science.

Keywords:

VO2(M1)doping gas sensing behavior inversion modulation negative−positive

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Area of Science:

Materials Science
Chemical Engineering
Solid State Physics

Background:

Anomalous gas sensing behavior necessitates re-evaluation of existing theories.
Element doping is explored as a method to induce specific gas sensing responses.

Purpose of the Study:

Investigate inversion gas sensing behavior in element-doped VO2(M1).
Understand how W, Mo, and Cr doping influence the gas sensing properties of VO2(M1).

Main Methods:

Synthesis of W/Mo/Cr-doped VO2(M1) samples.
Experimental investigation of gas sensing behaviors.

Main Results:

Doping modulates gas sensing behavior with opposite orientations.
W-doping maintains resistance-decreased sensing (-n type).
Mo/Cr-doping induces inversion sensing (-p type) via Schottky barrier formation due to Fermi level reduction.

Conclusions:

Element doping provides a route to control and invert gas sensing mechanisms in VO2(M1).
Schottky barrier formation is key to achieving inversion sensing in Mo/Cr-doped VO2(M1).
This work offers a novel perspective on gas sensing theory.