WO2020252673A1 - 一种提升可穿戴可拉伸电化学传感器检测性能的设计方法 - Google Patents
一种提升可穿戴可拉伸电化学传感器检测性能的设计方法 Download PDFInfo
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- the invention relates to the field of electrochemical sensors, in particular to a design method for improving the detection performance of a wearable stretchable electrochemical sensor.
- ISM ion selective membrane
- the new sweat sensor design is further developed into a wearable and stretchable electrochemical sensor (WSES).
- WSES wearable and stretchable electrochemical sensor
- the purpose of the present invention is to provide a design method for improving the detection performance of a wearable stretchable electrochemical sensor, aiming to solve the problem of insufficient robustness of the existing WSES design method to tensile strength .
- a design method for improving the detection performance of a wearable stretchable electrochemical sensor which includes the following steps:
- the wearable stretchable electrochemical sensor is optimized.
- the design method for improving the detection performance of a wearable stretchable electrochemical sensor wherein the orthogonal test design is used to obtain a design parameter matrix interpolation combination with a variable degree of dispersion and a stronger generalization ability.
- the steps to obtain the performance indicators of WSES under different tensile strengths include:
- L is the maximum tensile strength, and generate different tensile strength performance index matrices through WSES experiment among them y km,l represents the mth performance index obtained under the condition of tensile strength l using the kth group of design parameters.
- the performance indicators include detection range, linearity, stability and electrical impedance spectrum.
- the step of establishing a nonlinear regression model corresponding to each performance index according to the performance index includes:
- the step of using a multi-objective optimization method to simultaneously search for the Pareto non-dominant optimal solution of the performance index, and obtaining the WSES design result includes:
- Update g g+1, if g ⁇ G, return to calculation Corresponding performance index steps; if g ⁇ G, the update ends, and each individual in the P ND becomes the optimized design on the Pareto front end.
- rand(a,b) means returning a random number that obeys uniform distribution in the range of [a,b], max(x n ) and min(x n ) respectively represent the maximum and minimum values of the nth design parameter, L max Indicates the maximum tensile strength that WSES can withstand.
- the design method for improving the detection performance of a wearable stretchable electrochemical sensor wherein the calculation
- the corresponding performance indicators include steps:
- Update m m+1, if m ⁇ M, re-apply the regression model R m to estimate the current input Output when Until m ⁇ M, use non-dominated sorting genetic algorithm II to update the evolutionary population ps.
- the design method for improving the detection performance of a wearable stretchable electrochemical sensor provided by the present invention participates in the entire multi-objective optimization process by taking the tensile strength as the N+1 dimensional variable of the evolutionary individual, which can take into account other designs
- the relationship between parameters and tensile strength enables the optimal individuals in a non-dominant position to fully reflect the impact of different tensile strengths on the performance of WSES, ensuring the optimal performance under different tensile strengths, which solves the problem There is a problem of insufficient robustness of the WSES design method to tensile strength.
- Figure 1 is a schematic diagram of the structure of a WSES of the present invention.
- FIG. 2 is a schematic diagram of the graphene oxide-carbon nanotube structure of the three-dimensional hollow structure of the present invention.
- FIG. 3 is a flowchart of a preferred embodiment of a design method for improving the detection performance of a wearable stretchable electrochemical sensor according to the present invention.
- Fig. 4 is a flow chart of establishing multiple performance index models under different tensile strengths according to the present invention.
- Fig. 5 is a schematic diagram of the design parameter matrix X (N ⁇ K dimension) of the present invention.
- Fig. 6 is a schematic diagram of the performance index matrix Y (M ⁇ K dimension) of the present invention.
- Figure 7 is a matrix of multiple performance indicators for different tensile strengths of the present invention (M ⁇ K ⁇ L dimension) schematic diagram.
- Figure 8 is the regression training data pair of the mth performance index of the present invention (Under different tensile strength conditions) Schematic diagram of construction.
- Figure 9 is a flow chart of the multi-objective optimization design of the present invention.
- the present invention provides a design method for improving the detection performance of a wearable stretchable electrochemical sensor.
- the present invention will be described in further detail below. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention.
- Figure 1 and Figure 2 are a schematic diagram of a typical WSES structure and a three-dimensional hollow structure graphene oxide-carbon nanotube structure diagram, where REM is the reference electrode membrane (Reference Electrode Membrane), PU is Polyurethane (Polyurethane), PDMS is Polyurethane Poly-dimethylsiloxane (Poly-dimethylsiloxane), PU and PDMS are very soft after curing, suitable for flexible materials.
- Nonactin is an ionophore (ionophore), a chemical substance that reversibly binds ions, and can transmit target ions through the dielectric membrane. Nonactin is specifically used for the transmission of ammonia ions.
- Polyurethane, dioctyl sebacate (Bis-ethylhexyl , Sebacate, DOS) and tetrahydrofuran (Tetra Hydofuran, THF) are used as the matrix polymer of ion selective membranes, plasticizers and solvents.
- the WSES involves the setting of multiple parameters in the design process, as shown in Table 1.
- the main performance indicators of WSES include: 1. Detection range: The normal range of human sweat ammonia ion concentration is 10 -4 -10 -3 M, and the detection range is generally required to be 10 -6 -1 M. 2. Sensitivity: Take the logarithm based on 10 for the change of ammonia ion concentration from 10 -6 M to 1M. The higher the corresponding voltage, the greater the sensitivity. The general slope is 59mv/log[NH 4 +]. 3. Linearity: Under different tensile strengths (0%-40%), the sensor maintains a good linear response when the ammonia ion concentration is from 10 -4 M to 1M; at the same time, the electrode potential changes with the ion activity.
- the existing WSES design technology represented by 3D rGO-CNT has the following disadvantages:
- the adjustment process of the most important design parameters in the design process relies too much on the experience of the design engineer. If the engineer's ability is insufficient, the final performance indicators will inevitably decline; even if the design engineer has rich experience, the "adjust-verify" process It needs to be repeated many times, and the design engineer needs to participate in the whole process until the performance indicators are met. This is very time-consuming and labor-intensive, and the final result cannot be guaranteed to be the theoretical optimal value.
- the key and difficult design is the introduction of different tensile strengths.
- An optimal set of design parameters is obtained under a certain tensile strength.
- the performance indicators of WSES may be greatly interfered or even deteriorated sharply. Therefore, it is difficult for the same set of design parameters to take into account all the tensile strengths.
- Tensile strength is likely to cause poor overall performance of WSES.
- the changes of different tensile strengths and performance indicators show a non-linear relationship.
- the use of a simple linear regression model cannot guarantee the accuracy of performance prediction and simulation, resulting in high analysis difficulty and insufficient generalization performance.
- an embodiment of the present invention provides a design method for improving the detection performance of a wearable stretchable electrochemical sensor, wherein, as shown in FIG. 3, it includes the steps:
- This embodiment takes tensile strength as the N+1 dimensional variable of the evolutionary individual to participate in the entire multi-objective optimization process, which can take into account the relationship between other design parameters and tensile strength, so that the optimal individuals in a non-dominated position It can fully reflect the influence of different tensile strengths on the performance of WSES, and ensure the optimal performance under different tensile strengths. This solves the problem of insufficient robustness of the existing WSES design methods to tensile strength.
- the orthogonalization experiment design is used to obtain a design parameter matrix interpolation combination with variable dispersion and stronger generalization ability, and the WSES at different tensile strengths is obtained through electrochemical experiments.
- the following performance indicators and the steps of establishing a nonlinear regression model corresponding to each performance indicator according to the performance indicators specifically include:
- the design parameters can be selected from Table 1, As an example, the design parameters include electrodeposition voltage, electrodeposition time, the amount of REM, the amount of PVB, the amount of methanol sodium chloride, the amount of PU, the amount of PDMS, and the amount of ISM, but are not limited thereto;
- the performance indexes include detection range, linearity, stability, resistance Specific values such as anti-spectrum and sensitivity, but not limited to this;
- the model can simulate different tensile strength changes with a distance of 1% or less, avoiding setting L to 40, which significantly reduces the number of experiments; at the same time, the model is The simulation between different design parameters of K groups far exceeds the interpolation parameters of K groups. These two kinds of simulation performance improvements brought by regression models significantly reduce the cost of experiments and manpower equipment. Efficient nonlinear regression model ensures the accuracy of performance estimation and effectively reduces or even avoids design deviation.
- the step S30 using a multi-objective optimization method to simultaneously search for the Pareto non-dominant optimal solution of the performance index, to obtain the WSES design result, specifically includes:
- rand(a,b) means returning a random number that obeys uniform distribution in the range of [a,b], max(x n ) and min(x n ) respectively represent the maximum and minimum values of the nth design parameter, L max Indicates the maximum tensile strength that WSES can withstand;
- the method provided in this embodiment can realize the formation of multiple Pareto non-dominated set optimal schemes through independent operation, and their performance biases are different. If the WSES design requirements are changed, there is no need to re-experiment and model calculations, just select another set of design parameters that meet the requirements from the non-dominated optimal set.
- the method provided in this embodiment is suitable for a sensor for detecting the ammonia ion concentration of human sweat.
- the material of the sensor is changed, it is used to detect the blood glucose, lactate, sodium (Na+) ion or potassium ion (K+) of human sweat.
- this method is also suitable for the optimal design of the sensor, and only needs to modify the multi-performance index matrix and the multi-performance index matrix of different tensile strengths.
- the design method for improving the detection performance of a wearable stretchable electrochemical sensor takes the tensile strength as the N+1 dimensional variable of the evolutionary individual to participate in the entire multi-objective optimization process, which can take into account other aspects.
- the relationship between design parameters and tensile strength allows the optimal individuals in a non-dominant position to fully reflect the impact of different tensile strengths on the performance of WSES, ensuring the optimal performance under different tensile strengths, which solves
- the existing WSES design method has insufficient robustness to tensile strength.
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Abstract
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Claims (7)
- 一种提升可穿戴可拉伸电化学传感器检测性能的设计方法,其特征在于,包括步骤:使用正交化试验设计取得设计参数矩阵内插组合,通过电化学实验得到WSES在不同拉伸强度下的性能指标;根据所述性能指标建立与每个性能指标对应的非线性回归模型;使用多目标优化方法同时搜索性能指标的Pareto非支配最优解,获得WSES设计结果;根据所述WSES设计结果对所述可穿戴可拉伸电化学传感器进行优化设计。
- 根据权利要求1所述提升可穿戴可拉伸电化学传感器检测性能的设计方法,其特征在于,所述使用正交化试验设计取得离散程度可变、泛化能力更强的设计参数矩阵内插组合,通过电化学实验得到WSES在不同拉伸强度下的性能指标的步骤包括:设定WSES的设计参数,构成N维设计参数矢量X=[x 1,x 2,…,x n,…,x N],x n∈X,设定M维性能指标矢量Y=[y 1,y 2,…,y m,…,y M],y m∈Y;根据ODE设计,计算设计参数的内插组合,构成设计参数矩阵X={X 1,X 2,…,X k,…,X K};采用WSES进行实验,获得任意设计参数组合X k∈X所对应的性能指标矢量Y k,生成性能指标矩阵Y={Y 1,Y 2,…,Y k,…,Y K};
- 根据权利要求2所述提升可穿戴可拉伸电化学传感器检测性能的设计方法,其特征在于,所述性能指标包括检测范围、线性度、稳定性和电阻抗光谱。
- 根据权利要求2所述提升可穿戴可拉伸电化学传感器检测性能的设计方 法,其特征在于,根据所述性能指标建立与每个性能指标对应的非线性回归模型的步骤包括:综合k从1到K的所有设计参数组合,得到第m个性能指标的回归训练数据集Φ m={Φ 1m,Φ 2m,…,Φ km,…Φ Km},重复回归训练过程,直到形成所有M个性能指标的回归训练数据集Φ={Φ 1,Φ 2,…,Φ m,…Φ M};对于任意Φ m,使用非线性回归模型中的支持向量机或者极限学习机估计出回归模型R m,重复这过程直到估计出所有M个性能指标的回归模型;集成所有性能指标的回归模型构成多模型集合R={R 1,R 2,…,R m,…R M}。
- 根据权利要求1所述提升可穿戴可拉伸电化学传感器检测性能的设计方法,其特征在于,所述使用多目标优化方法同时搜索性能指标的Pareto非支配最优解,获得WSES设计结果的步骤包括:初始化迭代计数器g=0,设最大迭代次数G,初始化Pareto非支配集合P ND为空集;使用非支配排序遗传算法II更新进化种群ps;计算ps及P ND中所有个体的位置关系以及Pareto前端,选择其中处于非支配地位的个体,更新为新的P ND;
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