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Related Concept Videos

Photoelectric Effect02:26

Photoelectric Effect

When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
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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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Insight into the Multistate Emissive N, P-doped Carbon Nano-Onions: Emerging Visible-Light Absorption for

Subhajit Kar1, Kommula Bramhaiah1, Neena S John2

  • 1Department of Chemical Sciences, Indian Institute of Science Education and Research, Transit Campus (Govt. ITI Building), Engg. School Road, Berhampur, Odisha, 760010, India.

Chemistry, an Asian Journal
|March 18, 2021
PubMed
Summary

Nitrogen and phosphorus co-doped carbon dots (N, P-CNOs) with an onion-like structure were synthesized for enhanced visible light absorption. These novel carbon dots demonstrate efficient photocatalytic degradation of methylene blue dye.

Keywords:
BandgapCarbon nano-onionsLayered structurePhotocatalysisVisible light absorption

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Photocatalysis

Background:

  • Carbon dots (CDs) are emerging as alternatives to metal-based photocatalysts for solar light applications.
  • A significant limitation of traditional CDs is their insufficient absorption of visible light, hindering their photocatalytic efficiency.

Purpose of the Study:

  • To fabricate novel nitrogen and phosphorus co-doped carbon dots (N, P-CNOs) with enhanced visible light absorption.
  • To investigate the structure-property relationships and photocatalytic performance of the synthesized N, P-CNOs.

Main Methods:

  • A facile bottom-up synthesis technique using chitosan gel and phosphoric acid to create N, P-co-doped CDs with an onion-like layered structure.
  • Structural and elemental characterization (e.g., spectroscopy, electrochemistry) to analyze material properties.
  • Photophysical studies (steady-state and time-resolved fluorescence) to understand light-matter interactions.

Main Results:

  • The synthesized N, P-CNOs (25-50 nm) exhibited an enhanced visible light absorption due to their unique layered structure.
  • Electrochemical studies revealed reduced band gaps and new electronic states in N, P-CNOs compared to pristine N-CDs.
  • N, P-CNOs demonstrated efficient visible-light photocatalysis, degrading 75.8% of methylene blue dye within 120 minutes.

Conclusions:

  • The unique onion-like layered structure of N, P-CNOs significantly enhances visible light absorption and photocatalytic activity.
  • Easy synthesis and low cost make these N, P-CNOs promising candidates for visible-light photocatalysis applications.
  • The study establishes a strong correlation between the intrinsic structural features and the observed photophysical properties and photocatalytic performance.