Tuning CO₂ sensing properties of HPTS along with newly synthesized coordination polymers (CPs)

Coordination polymers (CPs), new functional hybrid materials, have received important attention due to their structural features and many different applications such as gas storage, catalysis, energy storage, small molecule adsorption, luminescence, and chemical sensors. In this study, two newly synthesized metal-organic frameworks (MOFs); [Mn₂(µ₄-dmg)-(µ₄-dmg)(µ-bipy)]_n (CP1) and [Mn₂(µ₄-dmg)(µ₄-dmg)(µ-dpeten)]_n (CP2); were used for sensing of gaseous carbon dioxide with a spectrofluorometric method with a dye, 8-hydroxypyrene-1, 3, 6-trisulfonic acid (HPTS) as matrix additive material for the first time. The ion-pair form of the HPTS was used in the polymethyl methacrylate matrix as a thin film form. When the HPTS based sensing slides along with the CPs, resulted in many advances such as high relative signal change and larger linear response range, improved sensor dynamics, and higher sensitivity with respect to the additive-free form. More specifically, in the presence of silver nanoparticles (AgNPs), the variation in relative signal intensities of CP1 and CP2 doped HPTS sensing agents were measured as 60 and 40% for the concentration range of 0-10% pCO₂, respectively. The aim of this study is to enhance the CO₂ response of HPTS with doped CPs due to their useful attributes and potential applications containing selective gas absorption.