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Thermal Sigmatropic Reactions: Overview01:16

Thermal Sigmatropic Reactions: Overview

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Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in 1,5-hexadiene, referred...
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San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
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A thermodynamic system is a set of objects whose thermodynamic properties are of interest. The system is considered to be embedded in its surroundings or the environment. The system and its environment can exchange heat and do work on each other through a boundary that separates them. However, the immediate surroundings of the system interact with it directly and therefore have a much stronger influence on its behavior and properties.
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The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
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A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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Related Experiment Video

Updated: Feb 20, 2026

Author Spotlight: Advancing Energy Solutions Using Nanocomposites as Processed Thermoelectric Materials
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Synergistically Optimizing the Thermoelectric Performance of n-Type SnS through an Integrated Systematic Approach.

Sidharth Duraisamy1, Yang-Yuan Chen1, Kuei-Hsien Chen2

  • 1Institute of Physics, Academia Sinica, 11529 Taipei, Taiwan.

ACS Applied Materials & Interfaces
|February 18, 2026
PubMed
Summary

Researchers developed n-type Tin(II) sulfide (SnS) with enhanced thermoelectric performance by managing vacancies and doping. This breakthrough offers a promising material for efficient thermoelectric devices.

Keywords:
halogen dopingn-type SnSselenium alloyingsulfur vacanciessynergistic combinationthermoelectric materials

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Thermoelectrics

Background:

  • Tin(II) sulfide (SnS) is a p-type semiconductor with excellent thermoelectric properties and eco-friendly characteristics.
  • Achieving n-type conductivity in SnS is difficult due to intrinsic tin (Sn) vacancies.

Purpose of the Study:

  • To synthesize n-type SnS with improved thermoelectric performance.
  • To overcome the challenge of Sn vacancies in n-type SnS.
  • To optimize SnS for thermoelectric applications.

Main Methods:

  • Solid-state reaction synthesis of polycrystalline n-type SnS1-δ.
  • Controlled introduction of sulfur vacancies to counteract Sn vacancies.
  • Aliovalent (Cl-) and isoelectronic (Se2-) substitutions for performance enhancement.
  • Addition of SnCl2 to compensate for intrinsic Sn vacancies.

Main Results:

  • Successfully synthesized n-type SnS1-δ samples with δ = 0.05 and 0.075.
  • Significantly enhanced thermoelectric performance through vacancy engineering and doping (Cl, Se).
  • Achieved a peak figure of merit (ZTmax) of ≈0.7 at 823 K and an average ZTave of ≈0.2 (308–823 K).
  • Observed the highest reported ZT values for n-type SnS.

Conclusions:

  • The study successfully optimized n-type SnS for superior thermoelectric performance.
  • Vacancy management and aliovalent/isoelectronic doping are effective strategies for n-type SnS.
  • This research paves the way for developing advanced SnS-based thermoelectric devices.