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Huang W, Yang Q, Liao J, Ramadan S, Fan X, Hu S, Liu X, Luo J, Tao R, Fu C. Integrated Rayleigh wave streaming-enhanced sensitivity of shear horizontal surface acoustic wave biosensors. Biosens Bioelectron 2024; 247:115944. [PMID: 38141441 DOI: 10.1016/j.bios.2023.115944] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Revised: 11/30/2023] [Accepted: 12/19/2023] [Indexed: 12/25/2023]
Abstract
Shear horizontal surface acoustic wave (SH-SAW) sensors are regarded as a promising alternative for label-free, sensitive, real time and low-cost detection. Nevertheless, achieving high sensitivity with SH-SAW has approached its limit imposed by the mass transport and probe-target affinity. We present here an SH-SAW biosensor accompanied by a unique Rayleigh wave-based actuator. The platform assembled on an ST-quartz substrate consists of dual-channel SH-SAW delay lines fabricated along a 90°-rotated direction, whilst another interdigital electrode (IDT) is orthogonally placed to generate Rayleigh waves so as to induce favourable streaming in the bio-chamber, enhancing the binding efficiency of the bio-target. Theoretical foundation and simulation have shown that Rayleigh acoustic streaming generates a level of agitation that accelerates the mass transport of the biomolecules to the surface. A fourfold improvement in sensitivity is achieved compared with conventional SH-SAW biosensors by means of complementary DNA hybridization with the aid of the Rayleigh wave device, giving a sensitivity level up to 6.15 Hz/(ng/mL) and a limit of detection of 0.617 ng/mL. This suggests that the proposed scheme could improve the sensitivity of SAW biosensors in real-time detection.
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Affiliation(s)
- Wenyi Huang
- College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China; School of Information and Communication Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, China
| | - Qutong Yang
- College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China
| | - Jiahui Liao
- College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China
| | - Sami Ramadan
- Department of Materials, Imperial College London, London, SW7 2AZ, United Kingdom
| | - Xiaoming Fan
- College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China
| | - Shenghe Hu
- College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China
| | - Xiaoyang Liu
- College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China
| | - Jingting Luo
- College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China.
| | - Ran Tao
- College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China
| | - Chen Fu
- College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China.
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