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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
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¹³C NMR: ¹H–¹³C Decoupling01:04

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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

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When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
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Decoding Upconversion-Emitting Phase in Complex Composites Through Single-Particle-Level Upconversion Imaging and

Yuwaraj K Kshetri1,2, Bina Chaudhary3, Jongwoo Kim4,5

  • 1Research Center for Green Advanced Materials, Sun Moon University, Chungnam, 31460, Republic of Korea.

Small (Weinheim an Der Bergstrasse, Germany)
|June 6, 2024
PubMed
Summary
This summary is machine-generated.

Lanthanide doping in NiMoO4 can create multiple phases. This study used advanced imaging and calculations to identify Ytterbium-doped Molybdate (Yb2Mo4O15) as the sole upconversion phase in the composite material.

Keywords:
DFT calculationMoO3/Yb2Mo4O15/NiMoO4 micro‐nano compositesingle‐particle‐level imagingupconversion

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Area of Science:

  • Materials Science
  • Solid State Chemistry
  • Nanotechnology

Background:

  • Upconversion phenomena are crucial for advanced optical applications.
  • Lanthanide doping typically aims to maintain host crystal structure.
  • Phase changes after doping complicate the identification of emitting phases.

Purpose of the Study:

  • To synthesize and characterize lanthanide-doped NiMoO4 upconversion phosphors.
  • To accurately identify the upconverting phase within a multi-phase composite.
  • To elucidate the relationship between phase stability and upconversion properties.

Main Methods:

  • Microwave hydrothermal synthesis of lanthanide-doped NiMoO4.
  • Density Functional Theory (DFT) calculations for phase stability analysis.
  • Single-particle-level upconversion imaging under 980 nm excitation.

Main Results:

  • A MoO3/Yb2Mo4O15/NiMoO4 micro-nano composite upconversion phosphor was synthesized.
  • Single-particle imaging resolved individual emitting and non-emitting regions.
  • Yb2Mo4O15 was identified as the sole upconversion emitting phase.
  • DFT calculations confirmed Yb2Mo4O15 as the most thermodynamically stable phase.

Conclusions:

  • Accurate phase identification in doped composites is achievable with combined DFT and imaging techniques.
  • Yb2Mo4O15 is the primary upconverting phase in the synthesized NiMoO4 composite.
  • Understanding phase stability is key to tailoring upconversion materials for applications like bioimaging and photonics.