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Na H, Park J, Jeong KH. Plasmon-enhanced optoacoustic transducer with Ecoflex thin film for broadband ultrasound generation using overdriven pulsed laser diode. JOURNAL OF BIOMEDICAL OPTICS 2023; 28:125005. [PMID: 38144698 PMCID: PMC10739335 DOI: 10.1117/1.jbo.28.12.125005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/08/2023] [Revised: 12/01/2023] [Accepted: 12/04/2023] [Indexed: 12/26/2023]
Abstract
Significance Ultrasonic transducers facilitate noninvasive biomedical imaging and therapeutic applications. Optoacoustic generation using nanoplasmonic structures provides a technical solution for highly efficient broadband ultrasonic transducer. However, bulky and high-cost nanosecond lasers as conventional excitation sources hinder a compact configuration of transducer. Aim Here, we report a plasmon-enhanced optoacoustic transducer (PEAT) for broadband ultrasound generation, featuring an overdriven pulsed laser diode (LD) and an Ecoflex thin film. The PEAT module consists of an LD, a collimating lens, a focusing lens, and an Ecoflex-coated 3D nanoplasmonic substrate (NPS). Approach The LD is overdriven above its nominal current and precisely modulated to achieve nanosecond pulsed beam with high optical peak power. The focused laser beam is injected on the NPS with high-density electromagnetic hotspots, which allows for the efficient plasmonic photothermal effect. The thermal expansion of Ecoflex finally generates broadband ultrasound. Results The overdriven pulsed LD achieves a maximum optical peak power of 40 W, exceeding the average optical power of 3 W. The 22 μ m thick Ecoflex-coated NPS exhibits an eightfold optoacoustic enhancement with a fractional - 6 dB bandwidth higher than 160% and a peak frequency of 2.5 MHz. In addition, the optoacoustic amplitude is precisely controlled by the optical peak power or the laser pulse width. The PEAT-integrated microfluidic chip clearly demonstrates acoustic atomization by generating aerosol droplets at the air-liquid interface. Conclusions Plasmon-enhanced optoacoustic generation using PEAT can provide an approach for compact and on-demand biomedical applications, such as ultrasound imaging and lab-on-a-chip technologies.
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Affiliation(s)
- Hamin Na
- Korea Advanced Institute of Science and Technology (KAIST), Department of Bio and Brain Engineering, Daejeon, Republic of Korea
- Korea Advanced Institute of Science and Technology (KAIST), KAIST Institute for Health Science and Technology (KIHST), Daejeon, Republic of Korea
| | - Jaehyeok Park
- Korea Advanced Institute of Science and Technology (KAIST), Department of Bio and Brain Engineering, Daejeon, Republic of Korea
- Korea Advanced Institute of Science and Technology (KAIST), KAIST Institute for Health Science and Technology (KIHST), Daejeon, Republic of Korea
| | - Ki-Hun Jeong
- Korea Advanced Institute of Science and Technology (KAIST), Department of Bio and Brain Engineering, Daejeon, Republic of Korea
- Korea Advanced Institute of Science and Technology (KAIST), KAIST Institute for Health Science and Technology (KIHST), Daejeon, Republic of Korea
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Sun JP, Ren YT, Gao RX, Gao BH, He MJ, Qi H. Influence of the temperature-dependent dielectric constant on the photoacoustic effect of gold nanospheres. Phys Chem Chem Phys 2022; 24:29667-29682. [PMID: 36453140 DOI: 10.1039/d2cp03866h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Photoacoustic imaging techniques with gold nanoparticles as contrast agents have received a great deal of attention. The photoacoustic response of gold nanoparticles strongly depends on the far-field optical properties, which essentially depend on the dielectric constant of the material. The dielectric constant of gold not only varies with wavelength but is also affected by temperature. However, the effect of the temperature dependence of the dielectric constant on gold nanoparticles' photoacoustic response has not been fully investigated. In this work, the Drude-Lorentz model and Mie theory are used to calculate the dielectric constant and absorption efficiency of gold nanospheres in aqueous solution, respectively. Then, the finite element method is used to simulate the heat transfer process of gold nanospheres and surrounding water. Finally, the one-dimensional velocity-stress equation is solved by the finite-difference time-domain method to obtain the photoacoustic response of gold nanospheres. The results show that under the irradiation of a high-fluence nanosecond pulse laser, ignoring the temperature dependence of the dielectric constant will lead to large errors in the photothermal response and the nonlinear photoacoustic signals (it can even exceed 20% and 30%). The relative error of the photothermal and photoacoustic response caused by ignoring the temperature-dependent dielectric constant is determined from both the temperature dependence of absorption efficiency and the maximum temperature increase of gold nanospheres. This work provides a new perspective for the photothermal and photoacoustic effects of gold nanospheres, which is meaningful for the development of high-resolution photoacoustic detectors and nano/microscale temperature measurement techniques.
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Affiliation(s)
- Jian-Ping Sun
- School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, China, 150001. .,Key Laboratory of Aerospace Thermophysics, Ministry of Industry and Information Technology, Harbin, China, 150001
| | - Ya-Tao Ren
- School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, China, 150001. .,Key Laboratory of Aerospace Thermophysics, Ministry of Industry and Information Technology, Harbin, China, 150001.,Faculty of Engineering, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | - Ren-Xi Gao
- Department of Optoelectronic Science, Harbin Institute of Technology at Weihai, Weihai 264209, China.
| | - Bao-Hai Gao
- School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, China, 150001. .,Key Laboratory of Aerospace Thermophysics, Ministry of Industry and Information Technology, Harbin, China, 150001
| | - Ming-Jian He
- School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, China, 150001. .,Key Laboratory of Aerospace Thermophysics, Ministry of Industry and Information Technology, Harbin, China, 150001
| | - Hong Qi
- School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, China, 150001. .,Key Laboratory of Aerospace Thermophysics, Ministry of Industry and Information Technology, Harbin, China, 150001
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Hsu YJ, Nain A, Lin YF, Tseng YT, Li YJ, Sangili A, Srivastava P, Yu HL, Huang YF, Huang CC, Chang HT. Self-redox reaction driven in situ formation of Cu 2O/Ti 3C 2T x nanosheets boost the photocatalytic eradication of multi-drug resistant bacteria from infected wound. J Nanobiotechnology 2022; 20:235. [PMID: 35590324 PMCID: PMC9117998 DOI: 10.1186/s12951-022-01428-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Accepted: 04/20/2022] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND MXenes with interesting optical and electrical properties have been attractive in biomedical applications such as antibacterial and anticancer agents, but their low photogeneration efficiency of reactive oxygen species (ROS) and poor stability are major concerns against microbial resistance. METHODS Water-dispersible single layer Ti3C2Tx-based MXene through etching tightly stacked MAX phase precursor using a minimally intensive layer delamination method. After addition of Cu(II) ions, the adsorbed Cu(II) ions underwent self-redox reactions with the surface oxygenated moieties of MXene, leading to in situ formation of Cu2O species to yield Cu2O/Ti3C2Tx nanosheets (heterostructures). RESULTS Under NIR irradiation, the Cu2O enhanced generation of electron-hole pairs, which boosted the photocatalytic production of superoxide and subsequent transformation into hydrogen peroxide. Broad-spectrum antimicrobial performance of Cu2O/Ti3C2Tx nanosheets with sharp edges is attributed to the direct contact-induced membrane disruption, localized photothermal therapy, and in situ generated cytotoxic free radicals. The minimum inhibitory concentration of Cu2O/Ti3C2Tx nanosheets reduced at least tenfold upon NIR laser irradiation compared to pristine Cu2O/Ti3C2Tx nanosheets. The Cu2O/Ti3C2Tx nanosheets were topically administrated on the methicillin-resistant Staphylococcus aureus (MRSA) infected wounds on diabetic mice. CONCLUSION Upon NIR illumination, Cu2O/Ti3C2Tx nanosheets eradicated MRSA and their associated biofilm to promote wound healing. The Cu2O/Ti3C2Tx nanosheets with superior catalytic and photothermal properties have a great scope as an effective antimicrobial modality for the treatment of infected wounds.
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Affiliation(s)
- Ya-Ju Hsu
- Department of Chemistry, National Taiwan University, Taipei, 10617, Taiwan
| | - Amit Nain
- Department of Chemistry, National Taiwan University, Taipei, 10617, Taiwan
| | - Yu-Feng Lin
- Department of Chemistry, National Taiwan University, Taipei, 10617, Taiwan
| | - Yu-Ting Tseng
- Department of Chemistry, National Taiwan University, Taipei, 10617, Taiwan
| | - Yu-Jia Li
- Department of Chemistry, National Taiwan University, Taipei, 10617, Taiwan
| | - Arumugam Sangili
- Department of Chemistry, National Taiwan University, Taipei, 10617, Taiwan
| | - Pavitra Srivastava
- School of Basic Sciences, Indian Institute of Technology, Kamand campus, Mandi, Himachal Pradesh, 175005, India
| | - Hui-Ling Yu
- Department of Chemistry, National Taiwan University, Taipei, 10617, Taiwan
| | - Yu-Fen Huang
- Institute of Analytical and Environmental Sciences, National Tsing Hua University, Hsinchu, 30013, Taiwan
| | - Chih-Ching Huang
- Department of Bioscience and Biotechnology and Center of Excellence for the Oceans, National Taiwan Ocean University, Keelung, 202301, Taiwan. .,School of Pharmacy, College of Pharmacy, Kaohsiung Medical University, Kaohsiung, 80708, Taiwan.
| | - Huan-Tsung Chang
- Department of Chemistry, National Taiwan University, Taipei, 10617, Taiwan.
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Zheng Z, Bindra AK, Jin H, Sun Q, Liu S, Zheng Y. Morphology-dependent resonance enhanced nonlinear photoacoustic effect in nanoparticle suspension: a temporal-spatial model. BIOMEDICAL OPTICS EXPRESS 2021; 12:7280-7296. [PMID: 35003833 PMCID: PMC8713686 DOI: 10.1364/boe.434207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Revised: 08/21/2021] [Accepted: 09/07/2021] [Indexed: 06/14/2023]
Abstract
The morphology-dependent resonances (MDRs) hotspot, ubiquity formed between the pairs of nanoparticles in close vicinity, has garnered considerable recent attention. By extending this phenomenon to pulse-laser irradiated nanoparticle suspension, we demonstrate that such collective optical/thermal enhancement can give rise to the nonlinear photoacoustic (PA) generation. In this study, a temporal-spatial analytical expression is derived to quantitatively describe the nonlinear PA signal generation from nanoparticles, incorporating the Grüneisen increase at the microscopic individual particle level and MRDs enhancement at the macroscopic suspension level. The dependence of PA nonlinearity on the critical contributors, including the laser pulse width, the particle size, and the statistical interparticle spacing, is quantitatively discussed. The theory is well validated with the finite element method (FEM) and experimentally proved with semiconducting polymer nanoparticles (SPN) suspension. This work may pave a new direction towards effective MDR based nonlinear PA contract agent design.
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Affiliation(s)
- Zesheng Zheng
- Nanyang Technological University, School of Electrical and Electronic Engineering, Singapore 639798, Singapore
| | - Anivind Kaur Bindra
- Nanyang Technological University, School of Physical and Mathematical Sciences, Singapore 637371, Singapore
| | - Haoran Jin
- Nanyang Technological University, School of Electrical and Electronic Engineering, Singapore 639798, Singapore
| | - Quqin Sun
- Nanyang Technological University, School of Electrical and Electronic Engineering, Singapore 639798, Singapore
| | - Siyu Liu
- Nanyang Technological University, School of Electrical and Electronic Engineering, Singapore 639798, Singapore
| | - Yuanjin Zheng
- Nanyang Technological University, School of Electrical and Electronic Engineering, Singapore 639798, Singapore
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Chang Y, Bai Q, Wang M, Ma Y, Yu K, Lu H, Lu T, Lin H, Qu F. Plasmonic Bi nanoparticles encapsulated by N-Carbon for dual-imaging and photothermal/photodynamic/chemo-therapy. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2021; 134:112546. [DOI: 10.1016/j.msec.2021.112546] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2021] [Revised: 10/29/2021] [Accepted: 11/07/2021] [Indexed: 11/28/2022]
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