text: Yo, check it out, copper ions in the house,
  They play a vital role, metabolizing all throughout,
  But too much or too little, it can mess you up,
  So we gotta detect those ions, keep health in the cut.
  
  We got a dope ratiometric paper-based sensor,
  Using dual-carbon dots, the flow's gonna enter,
  It's eco-friendly, portable, and low on the cost,
  Qualitative and semi-quantitative, we're not lost.
  
  Inkjet-printed test paper, the mix gotta be right,
  To maximize energy transfer, colors shining bright,
  We improved the b-CDs, boosting PLQY,
  Now we're rockin' with 88.9%, oh my!
  
  Sensitivity detection limit, we're talkin' solution,
  0.15 nM, that's the level of pollution,
  And even the human eye, it ain't no joke,
  Can spot at least 3 µmol L⁻¹, that's the stroke.
  
  Compared to single-emission, this sensor's the boss,
  Human eye more sensitive, detecting any loss,
  Micro detection on point, methods so fly,
  Visual detection of Cu²⁺, that's our battle cry.
  
  So remember, we're makin' moves, detection on the rise,
  Cu²⁺ got no chance, we'll catch 'em by surprise,
  With convenience and promise, we're here to stay,
  Detectin' those copper ions, every single day.