Have you heard anything about the development of a glassless solid-state pH sensor?
While there have been several attempts at a glassless solid-state pH electrode, most notably those based on ISFET technology, their adoption by our community has been less than stellar so we will set those aside. Which brings us to the Diamond FET pH sensor understood to be in development at Yokogawa. As the name implies, it utilizes a semiconductive diamond that delivers both physical robustness and chemical stability. I have included a link to a paper discussing the development of this pH sensor below for your reference. There are other solid-state pH sensors in development, most notable the one out of UC Davis, but Yokogawas’ effort best matches your question.