In recent news, the Centre for Nano and Soft Matter Sciences (CeNS) has made a breakthrough in heavy metal ion detection. They have developed a compact solid-state sensor capable of detecting heavy metal ions in water. This portable device assists in onsite detection even in remote areas.
Detection Potential and Mechanism
The innovative solid-state sensor can detect heavy metal ions, specifically lead ions (Pb2+), down to 0.4 parts per billion. The sensor works by utilizing a specially-prepared film formed into a composite by blending manganese-doped zinc sulfide quantum dots and reduced graphene oxide on a glass substrate. These particular quantum dots are water-soluble with high photoluminescence, making them appropriate for luminescence-based sensing. When exposed to handheld UV light of 254 nm, these quantum dots are activated, making the device portable to remote areas.
Heavy Metal Ion Detection
Exposure to a drop of water containing heavy metal ions like mercury, lead, or cadmium added to the composite film, will lead to the film’s emission extinguishing within seconds. This rapid response underlines the need for efficient and portable sensors for onsite detection of heavy metal ions, given the associated health risks.
Health Hazards of Heavy Metal Ions
Heavy metal ions pose major potential threats to living beings, directly affecting kidneys and bones. Prolonged exposure can lead to bio-accumulation in the body, which cannot be detoxified through chemical or biological processes. This is why the developed sensor is significantly important for easy detection of heavy metal ions in water. Despite this success, efforts are underway to enhance the selectivity of this detection.
About Centre for Nano and Soft Matter Sciences
CeNS is an independent research institute operating under the Department of Science and Technology (DST), Government of India, located in Jalahalli, Bengaluru. The DST supports the Centre with a grant-in-aid for conducting basic and applied research in nano and soft matter sciences. The Centre, established in 1991, focuses on materials research covering metal and semiconductor nanostructures, liquid crystals, gels, membranes, and hybrid materials.
Nano Mission Initiative
The Government of India launched Nano Mission in 2007 to promote basic research and infrastructure development in nanotechnology. The program focuses on human resource development, nano applications, technology development, and international collaborations. As part of the mission, national dialogues have been established to encourage R&D in standardization of nanotechnology and laying down a National Regulatory Framework Road-Map for Nanotechnology.
