We report an inkjet-printed paper based colorimetric sensor with silver nanoparticles (AgNPs) using smartphone and color detector App for on-site determination of mercuric ion (Hg²⁺) from environmental water samples. The AgNPs printed on Whatman filter paper (No. 1) is employed for detection of Hg²⁺ which is reliant on the color change of NPs from yellow to discoloration depending on the concentration of target analyte in sample solution. The quantitative determination was performed by calculating the signal intensity of AgNPs on printed paper substrate after the introduction of Hg²⁺ using smartphone and RGB color detector. The mechanism for detection of Hg²⁺ on paper substrate is verified using UV-Vis spectrophotometry (UV-Vis), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), dynamic light scattering (DLS) and basic chemical assays. The linear range acquired for paper based colorimetric detection in the range of 40–1200 µgL⁻¹ with limit of detection of 10 µgL⁻¹. The results obtained using an inkjet-printed paper-based chemical sensor combined with a smartphone is validated with data of inductively coupled plasma-atomic emission spectroscopy (ICP-AES) measurement. The advantages of paper based detection are simple, rapid, economic and can be applied at the sample sources for determination of Hg²⁺.

我们报告了使用智能手机和颜色检测器App的银纳米颗粒（AgNPs）喷墨打印纸基比色传感器，用于现场测定环境水样中的汞离子（Hg ²⁺）。印在Whatman滤纸（第1号）上的AgNP用于检测Hg ²⁺，这取决于NP从黄色到变色的NP颜色变化，具体取决于样品溶液中目标分析物的浓度。通过使用智能手机和RGB颜色检测器计算引入Hg ²⁺之后，计算印刷纸质基材上AgNPs的信号强度来进行定量测定。Hg ^2+的检测机制使用UV-Vis分光光度法（UV-Vis），透射电子显微镜（TEM），X射线光电子能谱（XPS），动态光散射（DLS）和基本化学分析对纸质基材上的纸张进行验证。用于纸基比色检测的线性范围为40–1200 µgL ^-1，检测极限为10 µgL ^-1。结合了智能手机使用喷墨打印纸基化学传感器获得的结果已通过电感耦合等离子体原子发射光谱（ICP-AES）测量数据进行了验证。纸基检测的优点是简单，快速，经济，可在样品源处用于测定Hg ²⁺。