Heavy metal detecting device and the fabricating method thereof

Abstract

The present invention provides a heavy metal detecting device and the fabricating method thereof. The heavy metal detecting device comprises a substrate and a nano-metal-particle array. The fabricating method of the heavy metal detecting device comprises following steps of: (S1) preparing a substrate, cleaning the substrate with a first liquid, and drying the substrate with a first gas; (S2) soaking the substrate in a first solution; (S3) after soaking the substrate for a first period of time, cleaning and drying the substrate with the first liquid and the first gas respectively; (S4) soaking the substrate in a pre-synthesized nano-metal-particle solution; and (S5) after soaking the substrate for a second period of time, cleaning and drying the substrate with a second liquid and the first gas respectively. Compared to the prior arts, the heavy metal detecting device of the present invention has the advantages of simplicity and rapidity.

Description

BACKGROUND OF THE INVENTION[0001]1. Cross-Reference to Related Applications[0002]This application claims priority from TW Patent Application No. 104125978, filed Aug. 10, 2015, which is hereby incorporated by reference in its entirety.[0003]2. Field of the Invention[0004]The present invention relates to a heavy metal detecting device and the fabricating method thereof, and more particularly, the present invention relates to a heavy metal detecting device and the fabricating method thereof with on-site quick detecting characteristic.[0005]3. Description of the Prior Art[0006]According to the announcement of EPA of Taiwan, the standard detecting method for detecting the Hg ions in the ground water is known as “the metal in the water and the micro-element detecting method, inductively coupled plasma atomic emission spectroscopy (W311.53C). This method can improve the accuracy of the analysis of the micro-element for detecting the different metal ions in the sample and further reach the...

AI Technical Summary

Benefits of technology

The invention is a heavy metal detecting device that uses a single-layer of nano-metal-particles on a substrate to quickly and easily detect the concentration of heavy metal ions in aqueous solution. The device is portable, cost-effective, and has high sensitivity and stability. The method is similar to analyzing the color of a sample using a smartphone. Overall, the invention provides a simple and efficient way to detect heavy metals in water.

Problems solved by technology

However, expensive devices, experienced operators and complicate process are required for this method, so the government needs to spend lots of time and money to monitor the environmental pollution.

If the analysis is able to be done quickly on the spot and only the samples with the positive test brought back to the laboratory, the cost will be down because the amount of the samples is greatly decreased.

However, XRF has many disadvantages such as expensive (for example, one million Taiwan dollars per device), easy to be affected by the spectrum of the different elements (for example, the spectrum of Pb and Hg is duplicable), easy to be affected by the environmental factors like the temperature and the liquid sample, and insensitive to some elements (for example, the detection limit for Hg ranges from 20 mg / L to 50 mg / L).

However, even though the Hg detecting method with utilizing Au nano-particles can achieve very low detecting concentration, it is complicate for the laboratories to do the process.

The efficiency of the method is low.

The solution used in the method is hard to carry, easy to leak and hard to reserve.

Moreover, there are a lot of unavoidable human errors.

In this experiment, Au nano-particles solution is still needed to be the probe even though it has the problems mentioned above (hard to reserve, carry and process).

Images