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南京农业大学智慧农业学院赵国‖【Anal. Chem.】无线无源RFID集成传感器:阻抗失配巧解土壤铅离子现场检测难题

  • 2026-04-30 00:40:07
南京农业大学智慧农业学院赵国‖【Anal. Chem.】无线无源RFID集成传感器:阻抗失配巧解土壤铅离子现场检测难题

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介绍 /Introduction

本研究提出了一种无线无源射频识别(RFID)集成传感器,用于土壤中Pb²⁺的现场快速检测,无需复杂的检测电路或高成本设备(如矢量网络分析仪)。该RFID集成传感器由射频芯片、标签天线以及rGO/LISM化学电阻传感单元构成,采用模块化设计(可重复使用的外壳/外围组件、通过夹子连接的可更换传感单元),以降低长期检测成本。此外,本研究还开发了一种基于阻抗失配的检测方法,通过搭建实验装置捕捉RFID集成传感器最小响应功率的变化。具体而言,土壤提取液中的Pb²⁺选择性透过LISM,并与rGO上的含氧官能团发生特异性化学吸附,从而改变传感单元的空穴载流子浓度,使其电阻增大,进而改变标签天线的阻抗。这一变化引发了射频芯片与标签天线之间的阻抗失配,而不同程度的阻抗失配直接调制了最小响应功率。经仿真与实验验证,该RFID集成传感器可在2分钟内快速检测实际土壤样品中的Pb²⁺,其均方根误差小于0.30 mg/kg,相对误差低于15%,加标回收率为85.23%~107.14%,是一种经济、快速的Pb²⁺检测解决方案。该方法同时为土壤重金属的现场快速检测提供了一种高效、简便的技术途径,具有实际应用前景。
相关成果以 “ A Wireless Passive RFID-Integrated Sensor for the Detection of Pb2+ in Soil: An Innovative Method Using Impedance Mismatch for OnSite Detection of Heavy Metals” 为题发表在《Anal. Chem.
全文速递南京农业大学智慧农业学院赵国‖Anal.Chem.无线无源RFID集成传感器阻抗失配巧解土壤铅离子现场检测难题.pdf

研究图/Introduction

Figure 1. Assembly procedure of the wireless passive RFID-integrated sensor.

Figure 2. (a) Photograph and (b) schematic of the RFID-integrated sensor.

Figure 3. Schematic of the detection platform for the wireless passive detection of Pb2+.

Figure 4. Schematic of the detection principle and process for Pb2+ in soil via the proposed detection method and the RFID-integrated sensor.
Figure 5. (a) Impedance, (b) S11, (d) gains in the electromagnetic field, (e) electric field distribution and (f) magnetic field distribution of the designed tag antenna derived from HFSS simulation. (c) Actual impedance of the designed tag antenna measured using a VNA.
Figure 6. (a) Structural designs of five RFID-integrated sensor prototypes: (i), (ii), (iii), (iv), and (v). (b) MRP response to equivalent resistance for the five designs. (c) Γ dependence on equivalent resistance across the five designs. (d) Comparison between the measured and simulated results of the equivalent resistance and Γ relationship curves. The structure of the RFID-integrated sensor should follow the layout depicted in Figure 6a(v). (e) Detection range and resolution comparison among the five designs. (f) MRP response to equivalent resistance at varied distances between the RF antenna and the RFID-integrated sensor (9-17 cm). (g) Dependence of the detection range and resolution on the detection distance. The detection distance between the RF antenna and the RFID-integrated sensor was fixed at 13 cm in all experiments.
Figure 7. (a) Equivalent circuit model of the RFID-integrated sensor. (b) Photograph of the RFID-integrated sensor with Rp. (c) MRP response to equivalent resistance for RFID-integrated sensors with varying parallel resistors. (d) Γ dependence on equivalent resistance in RFID-integrated sensors featuring different parallel resistors. (e) Detection range and resolution comparison among RFID-integrated sensors with different parallel resistors. The distance between the RF antenna and the RFID-integrated sensor was fixed at 13 cm in all experiments.
Figure 8. (a) Optical images of the rGO/LISM/LIG-based sensing unit fabricated with a laser scanning rate of 4 cm/s and a laser power of 2.2 W. (b) Electrode gap and width of the fabricated IDEs. SEM images of (c) rGO and (d) LIG. Raman spectra of (e) LIG, (f) GO, and rGO.
Figure 9. (a) Staircase sensing curves of Pb2+ in the concentration range of 100 ppb-10 ppm. (b) Linear fitting equation for Pb2+ detection in the concentration range of 100 ppb-10 ppm. (c) Comparison of the response to PBS buffer and 100 ppb Pb2+. (d) Response of the sensing unit to 10 ppm of different metal ions except for Pb2+ at 100 ppb.
Figure 10. (a) MRPs for Pb2+ detection over a dynamic range (100 ppb-10 ppm) achieved through tunable Rp. (b) VNA-measured S11 curves of RFID-integrated sensors with varying Rp under different concentrations of Pb2+. (c) Schematic of the wireless passive sensing mechanism of the proposed RFID-integrated sensor.

结论 /Conclusion

在本研究中,开发了一种专门用于检测土壤中 Pb2+ 的无线无源 RFID 集成传感器。该 RFID 集成传感器采用了一种将还原氧化石墨烯(rGO)与 LISM 相结合的纳米传感涂层,显著提高了对 Pb2+ 的灵敏度和特异性。值得注意的是,引入了一种基于阻抗失配的检测方法。该创新方法通过捕获由射频模块驱动的 RFID 集成传感器输出功率的变化,快速评估 Pb2+ 浓度。此外,这种方法极大地提高了 RFID 集成传感器的实用性,因为它不需要外部电源或诸如 VANs 这样的复杂设备。使用所提出的检测方法开发的 RFID 集成传感器表现出快速响应性,在 2 分钟内成功检测了真实土壤样本中的 Pb2+。重要的是,通过对真实土壤样本的分析,所有均方根误差均小于 0.30 毫克/千克,相对误差小于 15%,这表明所提出的检测方法可以作为 Pb2+ 经济、高效且快速的检测解决方案。此外,这种集成 RFID 的传感器采用模块化设计(可重复使用的外壳/外设,可更换的核心传感单元),极大地降低了长期检测成本,进一步增强了其实际应用潜力。本研究的成功不仅展示了集成 RFID 的传感器在环境监测方面的巨大潜力,还为未来的环境保护和公共卫生监测开辟了一条新途径。我们期待进一步优化集成 RFID 的传感器和检测方法,并探索其在检测其他环境参数和污染物方面的潜在应用。

文献直通车 /Literature information

A Wireless Passive RFID-Integrated Sensor for the Detection of Pb2+ in Soil: An Innovative Method Using Impedance Mismatch for OnSite Detection of Heavy Metals

Zuozheng Ding,§ Chengjie Gu,§ Lingling Yang, Junchao Zhang, Yihan Yao, Guowei Fan, and Guo Zhao*原文链接:https://doi.org/10.1021/acs.analchem.5c07268

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  1. CONNECT:[ UseTime:0.000519s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000717s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000315s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000282s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000498s ]
  6. SELECT * FROM `set` [ RunTime:0.000223s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000574s ]
  8. SELECT * FROM `article` WHERE `id` = 517092 LIMIT 1 [ RunTime:0.002839s ]
  9. UPDATE `article` SET `lasttime` = 1777543046 WHERE `id` = 517092 [ RunTime:0.012596s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000801s ]
  11. SELECT * FROM `article` WHERE `id` < 517092 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000572s ]
  12. SELECT * FROM `article` WHERE `id` > 517092 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002285s ]
  13. SELECT * FROM `article` WHERE `id` < 517092 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.017262s ]
  14. SELECT * FROM `article` WHERE `id` < 517092 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.012183s ]
  15. SELECT * FROM `article` WHERE `id` < 517092 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.015357s ]
0.133434s