Probing specific gravity in real-time with graphene oxide plasmonics†,Analytical Methods

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Probing specific gravity in real-time with graphene oxide plasmonics†
Analytical Methods ( IF 2.7 ) Pub Date : 2017-12-06 00:00:00 , DOI: 10.1039/c7ay02423a
Ainash Garifullina _{1,

2,

3,

4} , Nikhil Bhalla _{1,

2,

3,

4} , Amy Q. Shen _{1,

2,

3,

4}

Affiliation

Specific gravity (SG), the ratio of the density of a substance to the density of a reference material, is a standard indicator of the concentration of an analyte in a given solution. SG is routinely used for product quality assessment in the food industry. However, currently available commercial SG meters, such as hand-held refractometers and density meters, are highly sensitive to humidity and temperature, and do not allow real-time measurements. For these reasons, SG detection is often time-consuming which leads to unwanted interruptions in food manufacturing processes. Therefore, highly sensitive, label-free, and real-time sensors for the detection of SG are urgently needed for food quality control. In this context, we develop a graphene oxide (GO)-coated gold (Au) surface plasmon resonance (SPR) sensor, for the first time, to measure the SG of food samples in real-time. The SG values of sample solutions are correlated with the refractive indices (RI) of these solutions, which are captured by the SPR measurements, with a sensitivity of 10⁵ SPR response units. Moreover, the use of a GO coating provides a strong enhancement of plasmonic resonances due to its optoelectronic properties, doubling the sensitivity of SPR response units per RI unit (2 × 10⁵) when compared to conventional Au SPR chips (1 × 10⁵). We also validate our sensor performance by measuring the SG in real food samples. Our results demonstrate a highly sensitive, efficient, high throughput, and reproducible approach for SG measurements in food industry settings, and open new opportunities to utilize improved SPR sensor technology for many other label-free analytical sensing applications.

中文翻译：

使用氧化石墨烯等离子体来实时探测比重†

比重（SG）是物质密度与参考材料密度的比率，是给定溶液中分析物浓度的标准指标。SG通常用于食品行业的产品质量评估。但是，当前可用的商用SG仪表（例如手持式折光仪和密度计）对湿度和温度高度敏感，并且不允许进行实时测量。由于这些原因，SG检测通常很耗时，这会导致食品制造过程中不必要的中断。因此，迫切需要用于检测SG的高度灵敏，无标签且实时的传感器，以控制食品质量。在此背景下，我们首次开发了一种涂覆有氧化石墨烯（GO）的金（Au）表面等离振子共振（SPR）传感器，实时测量食品样本的SG。样品溶液的SG值与这些溶液的折射率（RI）相关，这些折射率通过SPR测量捕获，灵敏度为10^5个SPR响应单位。此外，GO涂层的光电特性可大大增强等离子体共振，与传统的Au SPR芯片（1×10⁵）相比，每个RI单元（2×10⁵）的SPR响应单元的灵敏度提高了一倍。。我们还通过测量实际食物样品中的SG来验证我们的传感器性能。我们的结果表明，在食品工业环境中进行SG测量具有高度灵敏，高效，高通量且可重现的方法，并为将改良的SPR传感器技术用于许多其他无标签的分析传感应用提供了新的机会。

更新日期：2017-12-06

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