Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 126, Issue 7, Pages 3489-3501Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.1c09245
Keywords
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Funding
- National Natural Science Foundation of China [51806047]
- Natural Science Foundation of Heilongjiang Province [LH2019E047]
- Interdisciplinary Research Foundation of HIT [IR2021235]
- European Union [839641]
- Marie Curie Actions (MSCA) [839641] Funding Source: Marie Curie Actions (MSCA)
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This study investigates the effect of heat-transfer ability on the nonlinear PA response of gold nanoparticles (GNPs) using the critical energy and fluence concept. The results show that the stronger the heat transferability, the smaller the critical energy, and the critical fluence can directly contrast the proportion of nonlinear components in the PA response of different GNPs.
Photoacoustic (PA) imaging using the nonlinear PA response of gold nanoparticles (GNPs) can effectively attenuate the interference from background noise caused by biomolecules (e.g., hemoglobin), thus offering a highly potential noninvasive biomedical imaging method. However, the mechanism of the nonlinear PA response of GNPs based on the thermal expansion mechanism, especially the effect of heat-transfer ability, still lacks quantitative investigation. Therefore, this work investigated the effect of heat-transfer ability on the nonlinear PA response of GNPs using the critical energy and fluence concept, taking into account the Au@SiO2 core-shell nanoparticles (weakened heat transfer) and gold nanochains (enhanced heat transfer). The results showed that the stronger the heat transferability, the smaller the critical energy, indicating that the nonlinear PA response of different nanoparticles cannot be contrasted directly through the critical energy. Moreover, the critical fluence can directly contrast the proportion of nonlinear components in the PA response of different GNPs as governed by the combined effect of heat transferability and photothermal conversion ability.
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